Yeah, I would buy her immediately for that price. I am surprised people are giving you trouble?
Heck yeah! She is a great looking pastel and $350 would be more than fair for a female of her size and quality. If I was in Canada I would be very interested in her!
I'm not surprised people are trying to talk the OP down, though. People can get outright rude/hostile about adult pricing. They think just because they can get a lower quality, male hatchling from "X" for $50 that your high quality adult female shouldn't be any more than the $50 and you're just a scammer taking advantage of people. I've gotten into many heated debates with folks over this very fact selling our balls.
Something to keep in mind with these replies, from my research, I believe this is a price difference in BP between the US and Canada. Still, as a Canadian, seems reasonable.
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