Training a horse how to stand still when mounting?

My seventeen y/o quarter horse is a perfect horse, except for the fact when you try to mount her (get on her), she backs up, turns towards you, anything but stays still. She stands fine when someone whos standing holds her by the reins right underneath her chin, while I get on, but it's quite annoying to ask someone to hold her. I've searched the internet (even youtube) for some advice on training your horse how to stand still, but I havent found any of them very helpful. Can anyone help? Thank you:)

Have you tried putting her in a corner? Are you accidently digging your toe into her? Are you short and her tall?

You might try snugging one rein so she can't go forward. If you think you might be bumping her use a mounting block. Make sure you're not bumping her mouth even if it means grabbing a handful of mane. When you get on and she's reasonably still praise her. If she backs up put her rump in a corner. If you can block her from walking that's part of the battle but make sure you're not making it uncomfortable for her. Sometimes we do things without realizing we're doing it.
If you're still stuck try barnmate.com

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