Anyone have Mother's Day gift ideas for a difficult mum?

I have a difficult relationship with my mum which has worsened over the past couple of years in particular. I moved abroad a few years ago which she never supported and she shows that by never visiting (it's a 1 hour flight away and she is wealthy and retired) or showing any interest in my life, and by cobstantly dropping not-so-subtle hints about me coming back to the UK.

She is a borderline hoarder so I don't really like getting her physical gifts, especially things like ornaments or jewellery as I know they will likely gather dust and never be used. Gift vouchers always feel a bit useless as she has plenty of money and if she went out for lunch on her own dime, she can afford to spend more than I could on the voucher for her. She is vaguely interested in ancestry and family history but other than that she doesn't have any hobbies or activities to fill her time. She mostly spends her retirement sitting at home on Facebook. She has a big garden but it's mostly full of fake plants and an astroturf lawn. She doesn't really read books or have a strong interest in music.

She is an incredibly difficult woman and in all honesty we might not have contact at all anymore in the future. But for now I'm keeping the peace and I know she does appreciate a card and gift even if our relationship for the other 364 days of the year is cold.

Sooo.. any ideas?