Everyone knows how to spell Violet.

Naming her Violette guarantees her a lifetime of correcting how other people spell her name.

Way more likely to be pronounced veye-oh-let or veyelet than vee-oh-let if you’re in the US.

I have an RL name that has a common alternate spelling and yes I need to correct people. It's not really a big deal to me, having to give my name in a way that involves my spelling it out is not an everyday occurrence. When someone mispells it on something like a takeout order it's fine, I really don't care.

Honestly, Violet/Violette is really not that bad as far as spelling things differently. Violette is kind of nice, and I'd be happy it wasn't Vylit or Vyelytte or something worse. If your main concern is that she will have to correct people, I mean... eh. It's had little to no effect on my life. If your partner feels strongly about it and you go along with it, you will still be doing a lot better than Talula Does The Hula in Hawaii.