To much to time for toddler?
Smart children actually gain from watching TV. Anyway, take her to the playground as much as you can.
Let your mother be the parent. If you don't want your sister to watch TV as often, then help your mom out by turning off the the TV and playing with your sister.
It seems like your sister may be autistic, she is going to find it hard to make friends
Not sure what your heading means.. To much to time for toddler??
Don't fall into the trap that tv is a good educational tool.Toddlers do not need electronics of any kind. Give them toys that inspire their imagination, books, costumes, and activities to do, and lots of outdoor time, but the electronics and tv have no place in a toddler's life.
Maybe your sister should go to daycare for part of the day at least 3 days per week. That would prepare her for school, and get her involved in other things. Mom could also sort things out easier.
The recommendation is 2 hours a day of screen time, be it a TV, laptop, pad or phone. It would be better to give your sister a book.