Is there any reason why i shouldn't give my paypal details to the seller?

[Tobermory]

Bid successfully on 3 items. After the auction ended she messaged me to suggest combined postage total and ask if that was ok. Which i think was very fair.
She then replied and asked for my email address so she could invoice me. Why would she not just invoice me via ebay?
Am i reading too much into this?

she has no need for your email address - she just sends the invoice via eBay. If she sends independent invoice it would not tie in with the eBay sale unless she enters item numbers I think. She is making it far more complicated than it needs to be too.

I don't know if you're reading too much into it but there is no reason why she would need it surely?! When you sell something don't you just send the invoice through the ebay page? Which then forwards through to the winning bidders email address? Don't give it to her, seems weird to me.

well thats what i thought but then couldnt decide if I was being uber-cautious.
I will ask her to invoice as usual

There is no reason at all, however she can raise the invoice via eBay.