Follow up to poshmark post

So I posted earlier about purchasing something on poshmark and the seller not sending it out. So I contacted her and she’s asked me to text her. I don’t know why she wouldn’t just message me on poshmark. Something seems fishy. When I look pack at previous users posts someone asks her for actual photos of the item she is selling as she only posts the stock photos from the online stores of the items she is selling which are literally 2 gems. she replied to this person to text her as well. Does this seem off to anyone else? Should I just cancel the order to be safe?