Do she have any other rings that she wears? You could use one of those. Or tell her you came across a new massage technic and that she should use it on her bf. Get some dough or play dough so u can make a mold of her finger. N make up a story along the way.

Go shopping with her. To like a Claire's. And you might have to get a ring. Check out the rings with her and try them on then pick a random one and say "look this one is nice for you. Try it on." 😐😐😐 lol. Usually those you have to take out to get the precise size. Because of the plastic and elastic take up space.

@trice4990 that's a good way!!!

Tell her you have some rings you're getting rid of and asks her if she wants them but you don't know if they'd fit her because you don't know her size! Then she should tell you😊

Does she have thin fingers

@skysmommy04 that's kinda how I feel!

Ugh this is a tough one she's waiting on it so any ring talk is gonna alarm her 😣😣😣

Or if her birthday is coming up say like o i saw this really cute ring for you what is your ring size so i can get it

Start talking about you can't remember your ring size and see if she will tell you hers.