Oh... i think that u can observe for some time...see if its sty or something uncomfortable. Otherwise maybe just get her eyes checked? Got family history of myopia? A lot of screen time can also cause dryness of eyes and some discomfort. Not to scare u but i did need glasses when i was in kindergarten (family history of myopia) - but ur LO is really v young to start
My dd is 6 and just started blinking her eyes alot about a week back. The doc said that it was probably a tic and to completely ignore it. Will keep you posted