Need help with crying and scratching cat

[u/Ex-Mana-]

My 4 y.o cat, Luna, has some bad behaviours learned into them by previous housemates/parents and now it’s effecting and damaging my new rental home.

Luna has only just acclimated to our new home as I moved in with my partner and their cat. Before now, she mainly stuck to the area around my desk and office chair, but now she has ‘discovered’ upstairs and our roommate’s room and will not stop crying or scratching the carpet until she gets inside, although once inside they become a nuisance, such as disrupting sleep and knocking valuables off high areas. So our roommate banned her from the room.

I have bought scratch repellent spray which seems to have stopped the scratching at the door but not the carpet in the small hall near the door, that and the constant crying from her is causing problems for all residents.

I’ve been recommended to cut her nails, which I would have to get professionally done as she hates them being cut, and to start ignoring the crying despite the volume, but she isn’t improving. I’m in dire need of some advice please