Help wanted identifying pattern please

Hi… Does anyone recognise the pattern for the baby cardigan sleeve pictured below please? I am trying to finish the garment (just the one sleeve to finish) for my mother who died just before christmas so that I can pass it on to the intended recipient. Unfortunately, it is not a pattern I have ever seen before and I can’t find anything similar on the internet despite searching for months. she must have knitted from memory because I can’t find the pattern anywhere. The first two pics are of the front of the sleeve and the last two are of the back of the sleeve. Any help would be greatly appreciated. Thanks in advance.

Don’t know if this is it or not, but there are lots of stitch patterns you could browse through if you don’t think this one is correct.

I’ve sorted it now. But thank you for your input. I spent the day and most of the evening trying out different stitch combinations and this is what I found worked.
Row 1. SSK, YO, SSK, repeat to end.
Row 2. P1, YO, P2tog, YO, P2tog, repeat to end
Row 3. K2tog, K1 into top of bottom hole, K2tog. Repeat to end.
Row 4. Purl.
Repeat last 4 rows for pattern.

Here’s a pic of the finished product. Just need to sew on the buttons now :slight_smile: (I noticed the finished garment looks white in the picture but it is definitely pale green. Probably the flash as it was taken at 1am when I finished!.. haha)

Very sorry to hear about your mother.
The sweater is lovely and it’s so good that you were able to finish her project. It’ll be most appreciated, I’m sure.