<human>: Thank you in advance for reading and considering our situation.

Three weeks ago, a stray cat came up to my girlfriend where we live. It was **super** friendly and affectionate. She put some food and water outside for it, but given that it was going to be below freezing, we decided to take it inside.

We have two cats and do not want more, but made the decision to foster and then adopt her out to another family (this was the advice given by the Humane Society instead of just turning it in). We had it spayed and given all requisite shots -she was kept away from our cats during this time.

Pretty soon after her operation, her demeanor changed. She no longer liked to be petted and wasn't affectionate at all. She apparently was in heat before her spaying, and we suspect that the only reason she appeared so nice was because of that - but I don't really know.

We at least part of it was that she was just healing, but it's been two weeks of this. Her incision is healing great and there is no evidence of any pain or other health issue. She's basically just really mean now.

We could still bring it into the Humane Society to have them try to adopt it, but given its personality, I am skeptical that it could get adopted.

I am really not sure what's appropriate at this stage. Do you have any advice to offer?

Again, thank you for reading and considering the situation.

Can you provide a brief overview of the text?
<bot>: Girlfriend found a stray cat who was super friendly. We began fostering it with the intent of adopting it out to someone, but after being spayed, it has become evil and now no one wants it.