If you decide on a Brother, don't purchase at WalMart...unless you want a throw away machine if somethinmeg goes wrong. Go for a Janome....even a slightly used machine. Check out machines at Brubakerssewing.com and Allbrands.com before buying.
Ask for Amy at Brubakers for the best deal on a used Janome. Many times, these are trade show machines, only used a few hours.
As beautiful as her quilts are, and as creative as she is, she needs a really great quilting machine. A 6600 would be fantastic, but if that is too costly, try the 3160 with the auto thread cutter....couldn't live with out it for piecing.