I am on ILR and looking to bring my mother here in the UK on dependent visa.
She is a widow, 75+ age, and in a very weak state.
Back home we can find a care staff to help her day to day chores, but the bigger problem is she being alone on her own, having no child around her to talk, and that makes her overall depress n sick

I can call her on visit visa here in UK but she wouldn’t have access to NHS, and if she fell sick I don’t know how NHS will treat her or how much they will charge $$$$ for private treatment. I have seen insurance plans, because of her age factor insurances are charging almost un-affordable premium.
Now the only realistic option is to apply dependent visa for her, which I hear is very difficult and rare.
Can someone please suggest do I have any strong grounds for a successful dependent visa??