S.P.
Well, this is a suggestion on what to do if you just CAN'T get it out. I've had to modify my response to similar type accidents.
If you simply CAN NOT get the polish out-then go with it. Grab the bottle of polish-lay the shirt out flat and paint on a tiny flower or small cluster of flowers where the polish got on the shirt. If it's in a strange spot you can always create little clusters of flowers here and there until it looks like it's MEANT to be there!
Or hearts or starts or whatever you wish. My kiddo gets stuff on her clothing all the time that is next to impossible to get out. Like Black permanent marker. All tricks aside-I finally sketched in a few daisies with long stems and the pants look like the flowers were already there. When we get compliments I just smile. LOL
Perhaps what someone else said will work for you. I've never been lucky with getting polish out of carpet-acetone or not. For me it always just kinda smears and makes a bigger spot. All the better for a colored in heart or center spot of simple flower...lol
Another suggestion if you just don't feel artsy is that you could simply gather cute pieces of cloth-even different textures in white (wherever fabric is sold there's often scraps you can purchase at reduced price) and simply sew on patches to cover up that spot and then add a few others to offset that one. Or if you're a non-sewer they have that nifty glue or iron on tape that makes patches and hemming a breeze!
Just a few ideas in case you find getting the polish out won't happen.
Blessings!