step daughter living at home got puppy without permission

She’s 25 and temp living in a house my partner and I got together. I knew she wanted a puppy, but thought she would wait till moving out. She didn’t and didn’t ask me or her dad 1st. I like dogs but it’s (of course) a puppy and you know the training process and accidents are going to happen. I haven’t said why didn’t you ask first because it’s done and I don’t want to affect daughter and my relationship- she takes things very personal… And she’s gone out of town and guess who’s puppy sitting… How do I get ok with this?
Thank you!