We agreed to cancel the 1st purchase,as she said the postal was too much.
A reasonable response.
Which I would have followed by an addition to my Blocked Bidders List.
buys it again, wanting expedited tracking.
See above BBL
using the postal page for the rate, I invoiced her for $5 less than shown postal.
I would have done this differently.
Since you did not advertise tracked expedited shipping, it would have been best to contact the buyer tell her the true price of her request.
And added this : https://www.canadapost.ca/cpotools/apps/far/business/findARate?execution=e1s1
This allows her to ask again for a cancellation OR refuse to pay.
If she doesn't pay, you open an Unpaid Item Dispute.
I would not agree to a second cancellation . Just go straight to the UID.
I waited 2 days for payment to no avail, and instead received her untrue feedback.
With a UID, you get your FVF back, she gets a Strike as a deadbeat and she cannot leave feedback.
Fortuneately, she did not leave negative or even neutral feedback.
Instead this customer flake, left positive feedback with negative words.
If anyone actually read the feedback she left she will sound a little nutty to them.
I think you should let it be.
Most bidders look only at feedback percentages.
Most who check actual feedback, look at the negs not the positives.
So you are pretty safe from blowback.
In theory you could leave a Response, but since there is a green donut, that would only make the comments MORE visible.
I know it hurts, but this is business not personal.
Weigh your outcomes.
Do nothing more and move on.
