Help me Help my Precious Cat

Asking for help is not something I like to do but I am asking for help to find out if my precious Tiger has cancer. I have had this cat for 12 years and she is one of my emotional support animals and is very precious to me. She’s been with me throughout my divorce , through difficult emotional times, and more and I want many more years with her. Recently I noticed a lump on her chest and it has grown , along with changes in her behavior like hiding all of the time under the bed and not being herself. I am extremely worried about losing her and would like to at least get a diagnosis of what is wrong with her.

I work hard at my job but my pay only covers rent and the basic expenses of bills and food for me and my three kitties, there is no spare income at all for anything , especially expensive veterinary treatments . Like I said , I don’t like to ask for help but I really would like to get her to see a vet and get a biopsy of this lump and possibly some blood work.

Anything is appreciated and every Penny will go to cover her medical care . I have recently signed up for pet insurance and sometimes they reimburse for covered medical treatments and if they did I would pay people back. This is only to make sure I get my precious kitty into see a doctor to see if she is sick and if I may lose her soon and if I do lose her , I will have funds to cremate her.

Thank you and if you can’t give , please share.