broken front entry door glass who pays

[Jimmy S.]

Tenant is been there 6 months and always on time. She called and told me when she got home the front entry glass pane was broken. I asked how it happened and she told me it was mabay because of old glass  Glass company says it was clearly hit with something you can see the impact point. She does have a dog and small child who plays in the living room.

Anyways its $120 to fix it. Would you eat it or take it out of her security deposit at the end or how would you handle it?

Thanks