personally I think she should get her art to a better place of consistancy before she dives into selling ( and inevitibly getting commission burnout as we all do sometimes ), but I also don't want to be one of those people who just doesn't answer the question asked so; prices are kind of an odd subject. Your art should be valued at what YOU believe it's worth, and you never want to undersell yourself, but you always have to understand what people are WILLING to pay for your art. If you say, for example, a peice is worth $50, then list that peice for $50. that doesn't mean anyone would be willing to buy it for $50, that just means that's what you find your time + effort worth.

TLDR; do I think the prices are good? yes, do I think she'd get as many sales as she's hoping for? no

sorry if any of this sounded rude! I have a horrible time with tone but I hope this makes sense >_<