Mm, I wasn't factoring that in because I figured it was due to Amy noticing Kiana was a parahuman and checking that out, and I was focused on the question of whether Amy actually had a crush rather than whether Vicky had a reasonable basis for suspecting one. You're right that would look like a salient data point from Vicky's perspective though, since she wouldn't know about Kiana being a parahuman since Amy is a good kid who actually respects medical confidentiality.
Vicky is, now that she thinks back on it, already assuming Kiana is probably parahuman, since she got flung into her with
significant force and it pretty much just dislocated her shoulder. It didn't cross her mind that that might have made Amy take longer, though. She's fairly confident that Kiana isn't Empire, since Amy was willing to heal her (and she lives with an Asian girl), and she doesn't fit the profiles for any of the other villain-type groups in town, so she's guessing "shady independent" or one of the anonymous hero-types for the moment.
Similarly, she suspects parahuman involvement in randomly-exploding-streetlight, but the ABB has no capes that match Mei (in this continuity the ABB has several capes, but the only woman is the wrong build), and for much the same reasons as Kiana is letting it lie.
And also, like Kiana, it could just be weird dumb luck. Enough that she'll turn a blind eye for the moment if it'll make Amy happy - especially since Amy must already know that they're parahuman, and is still acting how she is - that is to say, "an obvious crush" to Vicky's own definitely-not-motivated-reasoning-she-swears.
From the reader's perspective, note that Amy learned that Kiana was parahuman back in the hospital, when she checked to make sure Kiana hadn't gotten any nasty bloodborne pathogens or something. She
was using her powers that whole time in the park, Kiana could sense that, which is why Kiana herself didn't conclude anything odd was happening, though she has no real baseline for "how long should it take Panacea to heal something."
By process of elimination, then, it's one or more of the following:
- Panacea was doing something to her biologically, which Kiana failed to notice
- Panacea was doing a deeper scan than strictly necessary
- Something about Kiana is harder than normal to heal/evaluate
- Panacea was specifically using her powers without using them for anything on the off-chance that Kiana had a power-detecting powerset that she wanted to fool