dealing with friends who are drifting from Islam & bad influence

salam brothers and sisters -

I’m in a predicament and I would like some advice if you’re willing to give.
So I have this friend I’ve known for years and years but she’s been smoking and drinking for ages now and I’ve been guiding, advising her for the past 3 years and she still continues to do it.
I have never done any of the sort and from when we became friends she didn’t either but now She’s just changed completely to even dressing very immodestly and doing these in ramadan too which if I was to ask her years back, she would’ve sworn she’d never go that far
It’s sad seeing her take the path that will only lead her to a state and I’ve tried time and time again, made duas for years and still she’s the same
Even her own parents realised and they always ask about me to her because they know I’m one of the only sincere and “on deen” person she has
I’ve realised now me and her and on different wavelengths, the years she’s been badly influenced by other friends, I’ve actually been moving closer to Islam and as I’ve tried again and again I want to give up now as there’s only so much a person can do
You can only help those who want to be helped and I believe now I don’t want to continue associating myself with her which I also have been as in we don’t speak much anymore and to be honest I’m feeling much better so how should I tell her properly?
Any advice would be appreciated <3

Wa Alaikum As Salam Wa Rahmatullahi Wa Barakatuh.

Since, you're the only person on deen she has, don't leave her because she'll ultimately lose that one ray of guidance she could see. That way she'll never realise how far she's gone.

Make dua for her and one day, she'll turn back to you. Never feel hopeless after making Dua. No matter how many years have passed by.

Prophet Ayyub PBUH was patient for 40 years before helped arrived.
Prophet Zakariyyah PBUH and Ibrahim PBUH were blessed with kids in a very old age.
Prophet Nuh PBUH called his people towards Allah for 950 years.

Quran says, “Indeed with hardship comes ease”.

I disagree with the point where you said, 'You can only help those who want to be helped'.
If that's the case, how did Amr bin Al Aas (A.S) accept Islam? Wasn't he the one to ask the king of Abyssinia to send the Muslims back?

Hind (A.S) who chew the liver of Hamzah (R.A)
Keep advising her...Make Dua for her and you have your own circle of good friends and let her see how happy and content you're all the time. In case you feel low, don't show that to her. Let her see you're always happy and successful in life.
She'll begin to realise one day.

A few days ago my friend informed me that the mother of one of his Shaykh accepted Islam. Can you imagine? Son has grown up and becomes a Shaykh who's spreading Islam and teaching others and mother remained a disbeliever for a long time. He would be sad and there were times he'd laugh and immediately his face would change when he'd remember his mother.

May Allah make it easy.

No worries. I don't think I said anything that hurt you or any statement that contradicted your views. Apologies if that happened.

I agree, it needs patience and endurance. Its a long way ahead.