As one user put it in a lengthy comment, "She knows his intentions - and she claims it bothers her... But as soon as he gets caught trying to do something to the cat, instead of trying to calm things down and point out that the cat is now out of the house and no longer his financial problem - her reaction was to threaten you - as if this is somehow your fault.
"Your mother is lying to you and she is complicit with his efforts to get the cat put down."
Another user provided some advice to protect her scholarship, as her parents will have renewed power over her if they manage to sabotage that.
In their words, "ASAP you should update your contact details with the college you’re going to attend. They could intercept some important mail that could lead to you losing your full ride."
But ultimately, commenters emphasized that she's not the one who jeopardized her relationship with her mother and that she isn't the one who needs to repair it.
h/t: Reddit | EndOfDaysCredit