I have, a couple of times. And it worked out well. But I warn you, they're long

first time - BG: I was friends with a small group of girls in HS. we kept in touch during college, but somehow i managed to offend them, or do something while home on Christmas break freshman year. Still not quite sure what. Let's call the one Lisa. I had another friend, actually a former BF who transferred to Lisa's school, second semester. Let's call him Sam. Sam told me it was because at the NYE party Lisa and a couple other friend's hosted, I spent too much time talking to a guy from her school, who she had a crush on, and had invited. I just talked to him as I felt badly since we were all HS friends, and he didn't know anyone! So Lisa apparently was mad at me for that. Sam told me I should call her over the summer, so I did. All i remember is she answered the phone, all happy, but when she heard my voice, her tone completely changed and went cold. After that, we lost touch. end BG
FF about 25 years and it turns out both her parents and mine had moved from NJ to the same town in VA. Now her mom and mine were not friends, but as we had been friends since jr high, they had spoken on the phone, etc. When my dad passed away, her mom saw the obit, and called my mom, which I thought was very nice. Also, my mom told me Lisa's mom asked for my address, as Lisa wanted to send me a card. Which she did, but apparently it came back to her 3 times!
We then reconnected on FB, and met for lunch, which we now do every time I'm down, several times a year. we kind of wondered how we fell out of touch, and she thinks its because she didn't come come for summers in college, and we lost touch. I let her continue thinking that way, as it didn't make sense to dredge up the past. I think that may have been part of it, but essentially she and the others in the group kind of shut me out.
The second one wasn't someone getting back in touch CRIVINS! me, but involves my HS reunion. I was shy, quiet, and had very little self confidence in HS. I also was on a competitive sports team, not associated CRIVINS! school, so I went to school, practice, etc. but didn't have much of a life aside from that. while I had friends IN school, I didn't do much outside.
My 25th reunion was coming up, and I was on the fence about going. I had a fear when in school, even though I was friendly with people there, if I asked them to do something after school, on the weekend, they'd look at me and say "why would I want to hang out with YOU?" So I still had those old insecurities.
In the end, I told the one person i had kept in touch with, you go, and I will. I almsot backed out last minute, but ended up going. I am sooo glad I did. At this point, no one cared who you were, what you did, what you looked like, etc. everyone was happy to see everyone, and was friendly and welcoming. I had a blast, and have reconnecgted with a small group. And have gotten together periodically with them.
OP, is she close enough you can get together? Or would it just be an online thing? If you can get together, maybe just do coffee, or lunch. That way you aren't obligated to spend huge amounts of time with her, but you can see how she's turned out. You may be surprised. I know if it were me, I'd be curious enough to want to know how life had turned out for her, I'd do it.