Hey Melisssad...

I wouldn't call loving and caring about your grandmother as enmeshment. You obviously have a very loving relationship...that is okay and she has been there for you in the past. I think you are very kind and concerned and a great source of comfort to her. Perhaps, it is just the cycle of life...the coming and going and living and dying and fear of the future that is really the problem...
No matter what happens, these days with her will always remain in her heart and yours....
But yes, you do need to balance it with being able to love and care for yourself and others in your life. Find ways to ask for and allow for others to help her and her to help herself when she can and keep her dignity. Taking that away from others and your grandmother is not care-giving, but care-taking...just a little reminder.
If we love hard, we will grieve hard...but you know you have done the right things by her if you do it in a healthy manner, and she loves you and you will not have any regrets which is a true blessing...
There is always some vulnerability in truly loving someone, but it is worth it in the end.

Don't fret...love her and allow her to live and pass with grace, dignity and the knowledge that she has lived well and is very loved. What a beautiful gift...

You are stronger than you will ever know.

Gentle hugs...
wb