AITA for taking my friend’s sick dog to an expensive vet without her consent while she was away?

I (20M) agreed to dog sit for my friend Alma (22F) while she was away for a week to see her parents. On day three, her dog, Cherry, started vomiting and refused to eat. I called her but she didn’t pick up (she was at a festival). I panicked and took Cherry to the emergency vet, where they diagnosed her with a blockage and did a $1,400 surgery. Cherry is fine now.

Now when Alma got back, I gave her the bill, explaining it was an emergency and that was my only option. She completely blew up, saying she’d never have approved such an expensive option and would’ve waited to see if Cherry improved. She says she’s broke and can’t pay me back. Our mutual friends are split some say I saved Cherry’s life and didn't have anything better I could have done, others say I overstepped by not waiting longer coz "it's not like a dog could die that quick."

Alma is now ignoring me and told everyone we know that I “forced her into debt.”

AITA?