Hi cymru. Welcome to the forum.

I'm not a doctor and I have no medical qualifications.

My GP prescribes me Cinnarizine (also called Stugeron) following an attack of viral labyrinthitis some years back. This med is good for suppressing dizziness and nausea. However, I have absolutely no idea whether it would be helpful for your mother. 

If you want to try something off the wall, but which might just help, she could try New Era Combination S tissue salts. Again, these might not help. 

Hi cymru, I know first hand how difficult it is to deal with dizziness and balance problems, though not for the same reason as your poor mum. I hope she's doing well in other ways.

Here's a link to an article about coping strategies when dizzy

 healdove.com/.../seven-ways-to-cope-when-youre-dizzy

Another tip, if you're watching TV and it makes you dizzy, focus your eyes on a fixed point just off screen, say the ON light, then use your peripheral vision to follow the action. 

Do make sure the docs know how this is affecting your mum. You could ask if a referral to a balance clinic would be of any benefit. It's very draining and tiring to have balance problems. Unfortunately it can be depressing.

Hope your mum finds a way to cope.

regards, gamechanger