She's had it since February? I wouldn't hesitate to call and ask when it will be ready.
She told you she didn't have anything else to work on but then was working on other quilts ahead of yours? I'm guessing those people were "pushy" and that's why theirs got in line ahead of yours. That alone would leave a bad taste in my mouth.
Do whatever you're comfortable with but calling at this stage is entirely reasonable. IMHO.