OP, it would have been very difficult for your friend to tell you this, so you clearly mean an awful lot to her. Take that as a massive compliment about how special a person you are.
Makeup, hair dye, eyebrows... forget that stuff. What's important is getting you clean. I know when I'm depressed I don't want to wash either. I suggest you put a reminder on your phone for the same time each day and force yourself into the bathroom.
You need a proper wash. Are you just scared of getting stuck in the bath tub or do you actually not fit? Do you live with someone? If not, could someone (like your lovely friend) come round so there's someone in your home in case you do run into problems? You may be absolutely fine getting in and out, but if it gives you more confidence to know there's someone around to get help, why not get a friend to be there?
If you actually don't fit into the bath tub at all, well, you need a solution to that. If you don't have washing facilities that fit you, your current home is not suitable for you and you will have to consider costly works or moving.
When you wash, you also need to dry properly. That includes under all of the extra folds you have from being your size. If any patches of skin under your folds are sore/uncomfortable, you probably need to blitz them with some form of medicated cream - GPs can be difficult to reach, but you can walk into any pharmacy and ask them if they have a private consultation room. Pharmacists are more capable than many people give them credit for.
Wash your body daily (wash everything!), wash your hair at least every other day (more often if you've been sweating), use deodorant every day and brush your teeth at least twice a day (once in the morning and once before bed).
Things like makeup etc can come later if you want them to. For now, just focus on staying clean or the big long list is going to get overwhelming. A daily self-care routine will feel like hard work that you don't want to do, but you'll better in yourself if you keep forcing yourself to do it.
PS I think you're incredibly brave for starting this thread, and for asking for help. You might not think very much of yourself right now, but honestly, you're a super star.