Mrs Trellis

Mrs Trellis, oh so blue,
Painting can't be fun for you.
I have an image: are you not
sitting by a big paint pot?

I'm sure you are, but it will pass.
You'll soon be back to cut the grass.
I try to empathise with you
but, sorry, I don't have a clue

I wonder if Lisbeth is the actual Mrs Trellis from north Wales?