Help - being abused by buyer

[alive_girl]

I've never been in a situation like this before and was wondering if someone could help me. I am being sent abusive emails by a possibly mentally unstable buyer. On 3rd Dec I sold a pair of tights which the buyer requested to pick up instead of post. I said no problem but the buyer was unable to meet me at my work as planned so asked if she could pick up the following weekend. Again I agreed but she changed her mind later and asked if I would post the tights in an A4 envelope for $1.80 instead. I agreed to this on 13 Dec.

Besides the fact that the buyer's emails are nasty and a complete overreaction, I'm concerned that she'll be able to lodge a paypal dispute as I have no proof of postage due to posting the item as a letter as she requested. I was wondering if anyone knew whether Paypal would look at our email history and see that the buyer specifically requested postage with no tracking and agreed to not hold me liable for any damage (and as implied, disappearance) of the parcel?
It's also Christmas and the parcel may take more than a week to arrive due to the 3 public holidays but I doubt the buyer will factor this into her thoughts.
I've also resigned myself to the fact that she will leave negative feedback and am frustrated there is nothing I can do to warn other sellers about her unreasonable expectations. After viewing the feedback she's left previous sellers I really wish there was a way to leave negative feedback for buyers so other sellers can be warned of abusive horrible people to deal with such as this person.
I'm at a loss as to what to do and have unfortunately had my Christmas break ruined by this experience in addition to the problems I was having dealing with a family death.
Any advice would be really appreciated 😕

[alive_girl]

Thanks for the advice beach_and_home. Unfortunately I don't normally have time to check every buyer's feedback and in this case the buyer had 100% positive feedback - it's only when you view the feedback she's left for others that you get a true sense of what her transactions have been like. I normally try to accommodate a buyer's requests if I'm able to but I think in this case I was just unlucky to strike out with someone who's missing a few screws (if I can be frank). I actually do think the buyer has mental issues as her emails have been rambling to the point of disturbing. I made the mistake of giving her my mobile number to arrange the attempted pick ups and was concerned she might call me but she hasn't so far.
I'll definitely be reluctant to make similar arrangements with buyers in future. I think you're right, the postage cost and method were clearly specified in the listing from the beginning and I will stick to this in future. It was the buyer's changes of mind which delayed the whole process and led to this problem. Incidentally she lives in Leura and I'm in Sydney - she was planning to make the long trip on two occasions just to save a few dollars in postage but is suddenly put out because she couldn't get delivery within a week over Christmas? The logic applied by some buyers is truly bizarre.

[a_beautiful_room]

You have received some exceptionally good advice here. Without repeating what others have said I will just add a couple of points. Always do what will protect YOU not what suits the buyer. I would not have posted them in an envelope, it is very easy in such a situation to acquiesce and this is now, as you know, what happens! Some buyers are just a nightmare and your radar should have been waving madly by the time you got to this point with them. Ebay may well have removed any negative feedback had they asked for and been denied something which was not offered in the listing - in this case the cheaper method of posting.

Secondly, PayPal WILL accept a receipt showing the date of postage and the postcode as proof of post, I am not sure if you still have the A.P. receipt but this will save you if it gets to that. Hopefully it won't.

Come back if you need further advice and happy new year.