I have been in the exact same position as your wife, and I wanted to chime in with my 2 cents and to encourage both of you!
I was also about 1 cm dilated at 24 weeks with my first pg. and placed on hospitalized bed rest. I made it to 32 weeks and my daughter didn't need oxygen and only stayed 1 week in the hospital. Today she is a happy healthy 4-yr. old in the 95th % for height and weight and at her 4 yr. old check up the dr. was impressed that she was doing things at a 5-6 yr. old level (i.e. recognizing letters and words etc.) Not trying to brag, but I just want to encourage you that you could have a wonderful outcome!
With my second pg., we ended up with a 6 week NICU stay (due to issues other than prematurity) and I became very close friends with the mom of a 25-weeker--they had a long hard road in the NICU, but she just sent a picture of him and he is absolutely gorgeous and right on track for his adjusted age. So, even if she were to deliver now, it would be very difficult, and there can be lots of long-term complications...but especially if you were at CHOP I am sure your daughter could be OK. There are lots of miraculous stories.
That said, as hard as hospitalized bed rest is, and it totally sucks I know...it is still a million times easier than having a baby in the NICU--so any encouragement you can give that she strictly follows drs. orders is fantastic.
From my experience, this is what I would do differently if I were in the same sitution again...
I would insist on being transferred to the hospital with the highest level NICU. I accepted my drs. opinion that it wasn't neccessary, and it did turn out OK for us...but given my experiences since then, I would absolutely not accept no for an answer. It is a fact that it is better for a baby to be born at the hospital with the highest level of care available and much easier to transfer mom than baby. With my son, it killed me to see him be transferred and I was scared to death something would happen in the ambulance on the way. Also, emotionally it is very difficult if she were to deliver, and then the baby had to be taken immediately away to a different hospital. It is hard enough to deal with when your baby is in the same hospital as you--but extremely tough if they aren't, especially if she has a c-section and can't be discharged right away. I am sure the dr. will say this is not needed at this pt., but for me I would never put myself in that position again.
I would refuse any internals...unless she began contracting regularly or there was some indication for it...my dr. wanted to check me twice a week--when really it served no purpose other than to satisfy curiousity--it wasn't going to change the treatment--I was already on hospitalized bed rest, terb., with no bathroom privileges. In my opinion and from the many nurses I have become friends with since then (and also the maternal fetal specialist) it was totally unneccessary, could "stir things up" and introduce infection. But at the time I was really a wimp and didn't trust myself enough to speak up. My water ended up breaking at 32 weeks, and I delivered that night--now maybe it would have broken anyway--but I have to wonder what role the many internals played.
If your wife doesn't have a laptop get her one--there are lots of online support groups for women in similar situations. Also sidelines.org is awesome...and on miraclebabies.org there is a calculater where you put in the gestation and it tells you the likelihood of various complications--I found it very encouraging to check each day watch the percentages go down. Also then you can sign up for netflix and she can watch DVDs to pass the time.
This is probably the most stressful experience you will ever have, but I feel like it brought my husband and me so much closer...and you will never take your beautiful daughter for granted--I still thank God every day for my kids! Your wife really will need a lot of compassion though...it is hard to feel like your body is a failure at the most basic function, and like you can't protect your baby.
Take care and hang in there--you will get through this--just look forward to the first birthday and picture your sweet baby diving into the cake!