ASAK
ASAK Sister,
In my opinion, she knows very well how much you love her. So i would suggest you to obey her in all respects ( Except if she goes against the faith).
Also if you are to express it, do it by actions. Like help her do kitchen work, for example, do the dishes, or help her clean the dining table after dinner, or help her in cleaning the house. My Mom used to be very happy when i would just stand with her while she did the dishes after dinner, i was not even touching those dishes but standing there and talking to her and giving her company. she used to tell this to everyone that i help her in her work.
Also one suggestion is, since you are a sister, you can suggest her clothes, what looks good at her. Even today my mom asks me how does she look after dressing up. LOL.
If there is a gathering i make sure i sit only next to my mom no matter what. even if there is no chair next to hers i sit on the hand rest of her chair and put an arm around her. she loves it. i mean it is not smthg that i do deliberately to show off but it is a habit since many years.
Anyways Mom is a very special treasure that ALLAH SWT has given us , i think we should take care of her at all time.
JAK