Suggest going to Starbucks and listen carefully when they ask for her name.
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If you get a text from her (even if you know it's her) ask who it is. Then you'll have it written down and can figure out the pronunciation.
Bring up how your name or someone else's name is constantly mispronounced. Hopefully she'll chime in with her own mispronouciations and you can figure out what her name is (or at least what it's not!).
Note: I haven't actually tried any of these tactics but if you did let us know how it goes!
I usually just go with 'sorry, I didn't catch your name last time' and start to blush.
![Blush [smiley=blush.gif]](https://www.talk.uk-yankee.com/Smileys/classic/blush.gif)