It’s an odd one and probably outing so I’ve name changed, im a regular.
For the last 6 months or so, my Dsis has been sending herself gifts through the post and claiming they’re from various family members and an ‘admirer’ we are fairly certain she’s invented.
This all started before Christmas. She was wearing a bit of jewellery I’d never seen before and although not my taste, she was twiddling with it and clearly wanted us to notice it so I said ‘that’s a lovely necklace Dsis, I’ve not seen it before is it new?’ She replied:
‘Oh yes it is, it was a gift’
Me: ‘that’s lovely, it suits you’
Her: ‘it was from Aunty Jane’ (names changed obvs)
Now, it wasn’t her birthday and too early to be a Christmas present. we haven’t received gifts from aunty jane since we were 15 and I haven’t spoken to her for about 15 years since and to my knowledge, neither has Dsis. It was odd, but the conversation moved on and I totally forgot about it until Christmas Day when we were all opening presents. Dsis produced a bag for life absolutely chocked with presents all wrapped in the same 3 variations of Tesco wrapping paper (I know, because we had the same stuff).
Each present was addressed from a different member of the family, none of whom had sent me a present and to my knowledge, no one else including my parents who are more closely related. For reference, this isn’t unusual. My parents and their siblings have a no presents for adults policy because we have a massive family and everyone agrees with it. It’s heen this way for 20 years.
Finally Dsis reaches her last present and opens it to reveal a £400 handbag. She gasps and reads the tag which says ‘from you know who’. She read the tag aloud, I didn’t see it and neither did DH. Obviously this invited questions, but she did a lot of ‘oh no it’s nothing’ etc until finally saying she had a ‘secret admirer’ that she was seeing and he had sent the bag.
In Jan, Dsis had work done on her house so came to live with us for a week, but the work was delayed and she ended up staying for 5 weeks.
During this 5 weeks, every other day a package would arrive at our house addressed to her. We didn’t question it as it’s none of our business, but after 3 weeks or so we were sat at the dinner table and she said ‘I’m sorry about all the packages, it’s SA (secret admirer, although we had a name for him at this point) AGAIN’. A bit perplexed we just sort of said ‘no problem’. She then went to her room and produced a huge box full or ‘gifts’ and proceeded to show us them all. It was lots of costume jewellery, clothes, bags etc. She went through them all saying ‘this is from SA, this is from aunty pat, this is from mum, this is from uncle stan’ etc etc with the majority from SA.
Anyway, long story short one day she left the packaging from a ‘gift’ on the kitchen side and the invoice that came in the package was for her credit card and her name etc and most definately sent to herself.
We had a family gathering in April where I was able to confirm she had indeed been sending herself gifts by lightly bringing the gifts up ‘that was a lovely ring you sent to DSis aunty pat’ etc etc and all of them were completely confused. I got very good at saying ‘oh no sorry my mistake, I must have gotten it wrong’ 
I told DM what I’d discovered and she has no idea what’s going on either.
Is she unwell? I feel a mixture of worry and utter confusion about it, there’s no reason for her to lie to us. She must have spend ~£5k on this so far and that’s a lot of money to us and her.
Do I need to say something to her or WIBU to just go LC and ignore?