Personally, I don't think there's really an argument to be made about cheating here.
Sure, it might've been a trick, but ultimately all that happened was they shook hands while she had a static buildup. An entirely mundane event. Whether she got that static from another genjin or from rubbing her socks on the ground aggressively, is kinda irrelevant.
She was fully aware of the fact that she got zapped with static electricity. Regardless of whether it was intentional or not, she's a spider girl who should know her webs (and their limits/vulnerabilities) better than anyone -- so she should've realized she needed to change the web out, but she didn't. That's on her, taking her power for granted and underestimating her opponents. And she clearly understands this, which is why she didn't have any hard feelings about it.