I'm ADHD. My kids are ADHD.
They've been invited to Mensa (NO WAY!!) and are both in gifted. They each have an IEP, but it's so I can get them away from the mundane that's too easy for them that their schoolmates still need instruction to learn. The 7th grader is just finishing 9th grade Algebra and will get to be in the Model United Nations next year. The 5th grader participated in an Engineering Expo at the University here. I'd love to see their reaction if I told them we were going to get a check for their disabilities!!
The night before I took my ACT's back in the 80's I didn't sleep- was up playing Dungeons and Dorks (Hahahaha)- I still scored off the charts...ADHD isn't a handicap, but it does require coping mechanisms and different self-control.
I'd be curious to know what it's like to be 'normal' but I wouldn't want to be unable to get things done the way I do- it looks like I have 23 projects going, because I do, and it looks like nothing's getting done because everything is happening at once, all mishmash...but at the end of the day I whip out the 23 finished projects and a normal person has a couple that were finished in a linear fashion.
As for the gal who's an energy leech, you have to tell her directly that you think she's making a bad choice, tell her where she can get help, and then walk away. Enabling her is taking your energy from other things that you need to be able to focus on. I have a very dear friend walking down a path like that, and after 30 years of kindred sisterhood, I may have to walk away- it's bleeding me dry and she doesn't want to be saved, bottom line.
Pray hard, and leave it up to the One in control. You are very good and kind and can save those that want saving...perhaps volunteer the amount of time you would normally have given her.
Best of luck!