Two year olds by nature have trouble with transitions. How are you approaching her? Take the time to sit face to face, and for her to acknowledge you, before making your suggestion. If that isn't enough to ease it, you may need to phrase it as a question, "do you want to keep playing here or would you like to watch Dora, which is starting now?" If your goal is to actually move her, then the suggested phrase might be, "in 5 minutes Dora starts, and I would like you to come inside then. I will let you know again when there are 3 minutes left, 2 minutes, and 1 minute. Then we'll sing ABC, and you will follow me."
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).