Thanks for your replies everyone, and your well wishes. Lyra is doing ok today, and hopefully heals up fast.

It is a Montessori preschool, and they do have some small glass objects in the classroom, which is where she got it. I'm really torn because on the one hand, we pay a lot of money for good care and even though it could have happened fast, it could have also been a case of no one watching well enough. I'm also upset that no one has bothered to call or even email me today to ask how she is. However, it has been very good up until this point. Lyra has really thrived and enjoyed herself there...I'm still not sure what to do as far as keeping her there or moving her, but I am going to talk to the center about some of the things you all brought up.