you said: she used to keep shabbos but now feels she just cant.she knows that its important but she just feels its really not interesting and she said shes tryed a bunch of times but just doesnt feel she can, shell just be so bored and feel she has to do something.
The most important thing here is that she should know that she has support. if you are her friend, then you should be inviting her for shabbos as often as possible, let her know that you’re there for her for whatever she needs, support her, encourage her, NEVER make her feel obligated to anything, and make sure she knows that no matter what happens, you will keep doing that. if her family doesn’t keep shabbos, then obviously its going to be incredibly hard for her. so open your home, make it a ‘safe haven’ and show her the beauty of shabbos with your family, and do whatever it is u do to entertain yourselves on shabbos, and I’m sure things will work out.
for the record, Im not a rav or anything, just a baal techuva whose been through a kiruv organization, who has done some kiruv. work, and thats what I think.