Yes, absolutely. I've no idea about injuries/family issues/funding/lack of confidence or any other background stuff that might account for it (and vaguely all rings a bell) but Lucy's got a cracking game - would be great to see her up near the 500 mark (and she's still young too).
She plays her doubles partner from last week in the next round, 4th seed Amandine Cazeaux. She's ranked about 570 or so, and has been around a while (age 26), and plays a lot, making a lot of semis, but has never really broken out. Not an easy match at all but will be interesting to see how Lucy does.