Doll House Replacement Stairs

Hi all,

So this is a very, very long shot, but I thought I'd give it a go.

My niece is having a dolls house for her birthday - her mum bought it used a month or so ago and is going to paint/decorate it etc. It's missing a part of the staircase though (technically the second staircase), and we can't find where to buy a replacement from.

It's possible the house may have originally come from Toys R Us (from Google searching for it), but there's no brand on it at all. I've attached a picture if it's of any help to anyone - I'm just stuck on where to look now!

If anyone has any ideas of where to go next, I'd really appreciate it.

Thanks in advance!