wow...first of all, let me say i'm sorry about your kids, i hope they are well now.
i hate to say this, but i would just start looking for another job. obviously this place will never be accepting that life happens sometimes and we have to call in. at my job, i've had nurses walk out because they didn't like their assignment, aides as well...nothing happens to them. a few may be singled out, but the absence policy is NOT followed for everyone. the other night i had a cena whose nose would not stop running, she constantly had a kleenex and was sneezing and coughing. i sent her to the supervisor to keep her away from my pts, and they kept her on another unit. i actually found that out later that she had stayed, the sup told me she would be going home.

last year we did have an epidemic of the flu break out....about 10 people died from it, 75 percent of the buillding's pts had it, plus at least 50% of the staff. it was miserable. don't they learn from this???
right now they are on my about my attendance as well. i have lupus, asthma, migraines, and three herniated discs in my lumbar area. recently, i have had problems with my back and my migraines, and have called in 5 times in two months, always with doc notes. i am on my last write up before termination, even though all my excuses were documented. i also had to miss a day because my daughter became ill at daycare and i had to pick her up. so what i did was go and file for FMLA, so i can take time off as needed and they can't fire me for it. (of course, they'll fidn some stupid thing to fire me over i just know it). i turned it in friday, so i'm sure i'll be pulled in the Director's office. I actually learned from some nurses on this board that they did that, filed for FLMA and could take just a few days at a time, and you get up to 12 weeks per year. i would never miss that much (knock on wood), but i am sure they will not be happy about me learning about it. i don't care. as soon as i finish school i am out of there anyway.
do you really like it at that hospital? if so i wonder if you could ask for another chance. i mean, you had it all documented....it just burns me up when people that have legit problems are the ones who get fired. but i know some people at my facility that call in every other weekend just because they want to party, have been doing for the six months they've been there. ugh. i think you need to find another place, i hate to say that. if you have management who doesn't realize people get sick and have to miss work, i wouldn't want to work with them.
anyways, sorry to keep rambling here. you didn't say if you really liked where you were working. you deserve better anway. they wased all that money training you and just for four occurences they'll throw you out? unbelievable, esp since your eval was great otherwise. maybe you could ask them for another few months probation? i've seen that done at my job as well and they went for it. i guess it all depends on how bad you want to stay. sorry i couldn't help you. but i hope everything works out for you!