I have no idea why I would advocate this, but anyway, if your mum is a good sport, she might like these games.
The first is a simple wooden puzzle shaped like a wine bottle. As they say in the blurb, "Best stick to soft drinks if you want to solve this perplexing puzzle". Ha, I can see that! This 13 piece wooden puzzle with comes with a stand, and is an ideal gift. It's height is 25cm, so similar to a real wine bottle.
The second is a game where you have to try and release the bottle from the wooden puzzle without breaking it. It could take minutes or hours. Fortunately the puzzle solution is enclosed, although the bottle is not included.
If you order from Yellow Moon for under £50, your delivery is only £2.99, which isn't bad at all.
Not a particularly romantic mother's day gift idea, but a fun one if your mum would be up for it.