In her first appearance, she was a joke. Beaten by getting her legs stuck. Then she's in Villains for Hire and Masters of Evil, showing her as an actual villain and credible threat. Seems like they are really trying to make her out to be really competent. Here I thought she'd be another "one off female copy of a regular villain" like Lady Bullseye, and Marie Batroc and the daughter of Tarantula.
I'll be honest, I've kinda grown to like Lady Stilt-Man.