I'd try a few brands to see what fits your foot best, and not concentrate too much on the special lacing systems, etc.
However, one that a lot of girls like, that you should at least try on is BOA. It's got a little knob that you turn to tighten your laces - which is a lot nicer on your hands - it seems like a lot of girls who are newer to snowboarding struggle with traditional laces because pulling them tight can be really tough on your hands. Some people don't like BOA tho, so make sure to try it on!
Each brand fits feet a bit differently - so maybe folks could steer you towards some specific brands if you share a little about your foot shape? I've heard good things from girls about Northwave and Salomon, but they tend to be a bit narrower, while Burtons and 32's tend to be fairly wide. I've had good luck with Vans lately, which are narrower around the heel and wider around the toe box. I've also heard good things about k2's latest boots.
I haven't had great luck for durability with 32's recently. They totally fell apart after about 30-40 days of riding. - the material cracked at the ankle where the boot flexes, and just started ripping farther and farther back towards the heel.
Keep in mind that you may need to size down from your normal shoe size for a snug fit!
Also, you might ask around on shred betties - a ton of girls on there, so there'd be some more personal experiences from a female perspective.