Hi could be Astlibe or Aruncus [there is a dwarf form]. did it flower for her last year and can she remember what it looked like?

Wrong shaped leaves for Aruncus aesthusifolius.

Thanks Owd 👍

Looking again I wonder if it is one of the forms of Persicaria?
Could really do with a closer view of the leaves to be sure.
Astilbe does look a good id as well.

Thank you, Owd. I’ll put it to her and see if any ring a bell from buying them - she lost the labels. She enjoys gardening but admits she is forgetful re labels and names.

Looks very much like Astilbe Kate.