What is she doing on a dating app?

Maybe they're in an open relationship?

She wants you to babysit or a threesome.

Maybe that's what the plan is. She shows you a mirror and says "that's my husband" and then she'll say "OK now let's make 3 children!" She's probably thought their names too.

In the last couple years, I've seen more people using dating sites for finding friends or for hookups than actual dating.

Irony. You just can't help but love it. Hunny, personally, I suggest to go all-in, and let the cards come as they may. Invite the possibilities. It could only be negative if you allow it to be. Meet her husband and children. Maybe you will love them as well. Or, maybe you will realize that she is not the girl you really wanted to marry, and will no longer be pining away for her. Or, she will reaffirm for you exactly what kind of woman you truly want, and will know, with surety, when the one meant for you crosses your path (or even already there). Or, well...... there many more possibles. I am sure her invitation is truly innocent, and given with love. At least see that, if nothing else. (Sorry everyone! for being so fuckin positive. 😬)

So what's wrong with that? Except still hanging onto some really old silly teen feelings?

Maybe they're swingers or into some kind of couple's kink? I mean, if you ran into this person and reconnected over something like Facebook or LinkedIn or something... but she ran into you on a dating site, and now wants you to meet her husband? You might want to inquire. And if they're not in an open relationship, I'd keep in mind, as others have mentioned, you met on a dating app and she is married. You could be stepping into some drama. Having said all that, maybe she just wants to be friends? Men and women can be friends.

wait, why is she on a dating app?