My DD was nearly an Izabela, but DH wasn't too keen, so we chose a different name. I think Isabella (or any other spelling of it) is a beautiful name and only a very small percentage of the population will associate it with Twilight. Whatever name you pick, someone will always think you chose it for a reason that you didn't. (e.g. my DD is Diana and so many people think she is named after the Princess - she isn't). So if you love it, go for it. Otherwise, you could try a variation on the meaning. Isabel is the Spanish version of Elizabeth, so you could try one of its variations, e.g. Lisa.

Good luck.