good
yes, but it was also pre TS Loke and pre TS Gray, even if she didn't like to fight even before that she fought together with Gajeel and Natsu and than took the offer for S class exams even if she knew full well she would have to fight, Hiro decided to do it comically because he didn't want two mages who were way out of her league to slap her around
one of cherias abilities is to heal herself, if she stood up because of that it means it's not a 1 shot, but if she was hit hard enough she would be 1 shot because you can't heal yourself if youre hit too hard, and it would be silly to think that it would take more to 1 sot Chelia than it took to do as much damage to angel as Urano Metria, Angel is a member of Oracion Deis while Cheria was mean to be the opponent for Wendy
even if she was recovering slower that doesn't mean she wouldnt have regained enough power to be up and running as soon as Lucy was if that was the truth, Wendy was out for so long because the hit affected her more because she is weaker
you can say it was a plot in the same way you could say it was a plot that chelia didn't use the secret god art again to 1 shot and possibly kill Wendy, the same way it was a plot that Wendy got her sky drill so that she could just have something new in the gmg, the same way it was a plot that Lucy didt wipe the floor with Flare but instead Raven Tail cheated ... twice, ... ofc it was a plot, everything Hiro writes is plot, but that doesn't matter as it still happened in the manga
Wendy is about as strong as a 12 year old Gajeel, maybe because of the plot she is shown a little stronger but the fact remains that she is a 12 yo 1st gen DS like Gajeel was at that time, Natsu too but Natsu is the MC and the guy whos gonna one day take on Zeref so it seems he's special