Buyer giving me a hard time

Just looking for some insight. Bit of a rant... I want to preface this by saying I am soooo sick right now, and I know I am emotional. I wanted to post screen shots but I kept seeing little parts I forgot to block out of her username and I do not want to doxx this person. Here's what happened

-Friday, this person purchased an item from me that I agreed to super discount for her

-last night after I was in bed she asked me to cancel because I hadn't shipped yet

-this morning I wake up to a note that it's been escalated to poshmark support AND another message from her.

- I cancel the order

-she THEN COMMENTS ON THE ITEM "I have sent you two messages please cancel my order" which I had already done! I replied that it had been cancelled.

- I sent a screenshot of the cancellation confirmation in the direct messages.

- I blocked her.

Here's my questions. First of all was she unable to cancel herself? Secondly will I be negatively impacted here at all? I'm just so annoyed I'm not Amazon I'm a person with a family and I sometimes need more than 8 hours to take care of an issue. Damn. Rant over.