Help! Talking with Recruiter

So I worked at a nursing home with a high turnover rate- a one star facility- which obviously has a lot of problems. I started there part time and after about a year went per diem because of how bad it was and have been doing per diem/ child care for a relative. The facility recently hired a lot of new grads and there's maybe only two experienced staff members remaining. Obviously I want to get out. The facility is also trying to sell itself to a new company.

I applied for a hospital and a recruiter called and boy, is she tough!

She's going to call again tomorrow but after our initial discussion I can tell she is a disappointed...

She wants to know why I went per diem and why I would want to work at the hospital now. It's just that my facility was so bad (no supplies, high volume patients,) that I don't feel comfortable working there anymore. I really don't know what to say because I don't want to bad mouth my former facility.

She says shell call back later or tomorrow- what else is she going to ask? it doesn't seem like it's going to go well for me...