A quick plant ID for dd please

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Dd found this in our garden and is wondering what it is. Does anybody know?
TIA

It looks a bit like a rose of Sharon.

The petals don't quite look big enough and the middle isn't hairy enough from online comparison but it might not have come out enough.
Thank you for your reply :)

Do you have any leaves or pics of it growing? It's quite hard to ID just from a flower, sometimes.
It looks a bit like a celandine.

No! She's found the only one and she can't work out which plant it was from. It was a long stalk with no leaves according to her. I shall look at celandine.
It may of course be some random weed!

Looks like this

Lesser Celandine (Harbinger-of-Spring)

Long stem would suggest Wood Avens. It's in the geum family.

Kermit thanks but that looks like 7 petals?
Marklah wood avens could well be it! Dd has accepted that as a good enough match
Thanks all!

Looks like yellow weed in my garden which after a bit of searching appears to be greater celandine.

very very orange sap if it is.

www.rhs.org.uk/Plants/3711/i-Chelidonium-majus-i/Details

Looks like greater celandine to me too. It's now in flower in my area. A weed in my garden, it's very pretty but spreads everywhere and harbours whitefly.