I would be going with instinct. If they didn't alert you to what happened, then its' possible she was getting hit at the beginning and no one knew or bothered to say.
Can you find an alternate daycare and book her in? Are there any besides ABC in your area? I just haven't heard alot of positive from ABC (sorry to generalise, I haven't heard positive from my sister whose kids went there, or from my friend who worked there and quit because it wasnt' very well run. )
If you're easy on what day/days she goes in, it shouldn't be hard to get in to another centre. If you take what they have avail they usually have a spot.
good luck and hope things work out xo