Her life is just tit and deep down she knows it, even if she tries to portray how much she loveees spending time home alone and how she wouldn't be able to live with a partner, or her delusion into thinking she has friends... She might have periods of temporary happiness (buying her house, opening her shop) but once the first thrill has passed she's still alone. The thing is it's gotten to a point where I can't see her changing it. How do you get a life at this point? Make genuine and healthy friends at 26 when you have literally no one? I'm sure it's possible but.. how? It's obvious that internet friendships don't work for her, so maybe getting a job and being forced to spend a certain amount of time with people and developing a connection...? Still, her internet past might haunt her. Using an app? I just can't see her ever having the balls to try and meet people online. It's sad because she's the artifice of her unhappiness, as her decisions and behavior are what have gotten her to this point. I'm sure that therapy would help her, but I believe that there's more to it and that what would really change her life would be to have some sort of regular job that involved leaving the house on a daily basis and for a certain number of hours.
I'm a very sociable person and have close close friends, but ever since covid and having to work from home I've seen how my mental health has deteriorated because of having to spend so much time home alone. Not having to get dressed, not leaving the house, not working in an "office environment" (that puts certain pressure on you agains being in your literal house) makes the days pretty repetitive and dull... and Gabby's been living like this FOR YEARS!
I believe a good start for her would be to rent some sort of office space, like a coworking area at a studio or something... once the situation is safe, obviously. Maybe slowly but steadily she would become more comfortable and actually start to enjoy being around other people and from there start changing her life in general.