L.O.
Yes she is too young. Give her a sippy cup until she can manage a cup without a lid by herself.
My duaghter is 27 months and she still has a zippy cup.
She did learn to use a straw- and we have sippy cups with straws that she does well with.
We also took the valve out of the sippy cup when she stopped throwing them off of the highchair tray and turning the cups upside down to watch the milk spill.
You can teach her to drink from a straw with a milk shake.. go buy a milk shake and suck on the straw so the shake is up by the top.. then give it to her. after a coule of times she will get it.
I dont know why you would want to get rid of sippy cups.. they cut down on spills mess and clean up.