Help and advice needed

Hello, I’ve been googling about what to do when a partner is having a psychosis issue and found this website! My partner has always been someone who doesn’t fully trust everyone and when she drinks a lot can get angry (never physically but mentally) but after 2 1/2 years something has changed drastically! She had Covid two weeks ago and after she recovered from that at home she started saying things that I thought were just plain crazy! I’m now thinking she is having a complete psychosis breakdown! She thinks Her family, friends and me are all monitoring her, that we are working together trying to get her to do what we want her to do, thinks we are secretly giving her antidepressants, videoing her and everything I say about anything incl the weather or that I put on TV is my way of telling her what’s wrong with her or what she has done or thinking is wrong! She says she can’t trust anyone and doesn’t feel safe anywhere, said she was going to drive to A mental hospital but then that I think scares her or she doesn’t believe she needs to. She is either crying uncontrollably or emotionally cold & empty and not having any connection to my emotions when I’m crying and scared. At first I did try prove her thoughts wrong that nothing she was saying was true but it’s only isolated her more! I’m now trying to show support and be a sounding board to hear and respect her fears so now talk calmly, even though I’m dying inside and feel completely helpless! I don’t know who to get her help from and if I do it behind her back the feeling she can’t trust me will be proven right and I’m scared she will hurt herself by putting herself in an unsafe place (the streets) I don’t know what to do! I’ve even read that Covid has caused mental issues after in some cases! I’m lost 😢