2 things:
-
Does she want a knit veil? I knit and crochet lace and I don't want either in my wedding outfit. Also, be sure what kind of veil she wants - there's different lengths, alone with a current trend for wearing capes made of gauze/tulle instead. Maybe ask her opinion on those motifs too.
-
What color is her dress? That yarn will probably look ok with ivory, and will definitely go with cream, champagne, etc. It won't match a bright white dress, nor the sort of sparkle tulle princess thing my sister picked out.
I think you can do it though. Lace knitting isn't that different from regular knitting, just more counting and yarn overs. Learn how to read lace charts before starting - I went in with a "how hard can it be, I do crochet charts" mentality and whoops, had to stop and look it up. Good luck :)