So far, Klee has been featured in two banners, and it may be possible that she may have a re-run again shortly. Some characters had three re-runs, and Klee may likely re-run in a promoted banner with 4-star characters. In the end, its' all speculation from my end, but I'll recommend you to save up some primogems or intertwined fates just in case. I won't suggest you pre-farm for her because if she doesn't get a re-run banner, you will be wasting your resources. So, for now, I would advise you to keep yourself up-to-date with Genshin Impact's official channels and see if they announce a Klee re-run.