I am so sorry that you are losing your mom and not be able to be with her. It is so obvious how much you love your mom and want to be with her. Can you talk to by phone even if a family member is with her and they put the phone up to her ear they say the last thing that goes is one's hearing. Being able to tell her the things that you need to say may be good for you to do if you can do that. Or perhaps telling somebody who is with her what you would like to say would work out.
In any case....your mom must know how much you love her and understands how difficult it is for you to be with her.
There is one thing for sure....even though you may lose your mom physically to death she will continue to live on in your heart and your memory. That can never be taken away or lost....it is your gift to keep.
One thing that has comforted me when I have lost a loved one is to remember that each of us are given a body to take care of our soul...it is on borrowed time and is called back to our Maker when the time is right. Our body is the empty shell left behind but our soul goes on to live in the next life which is where we are destined to be and will all meet up again.
So you will see your mom again, at least that is what we learn in our faith.
I hope that you can feel your mom's love and know that she will always be with you so long as you remember her and carry her in your heart.
May God bless you and comfort you during this time.
(((HUGS))) ~ Goody