Betta live up to 10-20 years. Besides, she isn't even a year old. I tried doing that once but I'm scared that I might hurt her by doing that. I don't want to overload her in any way.
Technically if they were in a 10 gallon tank, with other fish like tetra and shrimp, they would co-exist. For female betta it's 5 gallons per female for co-existence. I have 2 betta sororities. I know how to care for them.
Dreza got sick in the quarantine chamber that I had set up in the 40 gallon sorority. She needs other betta females or she gets insecure. Because she couldn't swim freely with her sisters(and two of the other females really are her sisters, she got stressed out and developed fin rot. I had finals and didn't notice right away until it got really bad.
Dreza and Feira are in separate rooms but Feira is older(a little over a year old) and very magically inclined so barriers like walls don't matter to her. She knows my emotions and knows that Dreza is sick so she wants to help.
I think I need to mention that Feira is a animal guardian, so she is very, very magically inclined. She does know what she's doing, however since this is hurting her, I'm worried about her safety as well. Betta has delicate systems, guardian animal or not, I don't want to loose her too.
Please don't respond if all you have is betta fish advice. I don't need nor want it. I want magically advice on how to heal my Dreza.