Cute mare, and she sounds as though she'd be great for a girl. If your mom had moved sooner, she could have tried to market her as a Christmas gift.

Post-Christmas, mid-winter, Northern California- $1000. It could be argued that she's "worth" more, but the weight limitation is tough and I think finding her a happy home would take precedence. Plus it sounds as though she's been out of work and there may not be someone to show her under saddle to buyers.