What is your opinion, is this ptosis or not? Have you ever encountered this situation? Is this ptosis or not? (Photo)

My 12 months baby has, from time to time, her left eyelid was bigger than the right one. We made the RNS at 11 months. We managed to make 2 (two) clean impulses. The second response was stronger then first. We visited the Ophthalmology, during a ptosis episode. She told us that the girl has just one extra fold to the eyelid and that what she has is not ptosis. Lately, I observed that the ptosis episodes are more frequent and last longer than before. What is your opinion, is this ptosis or not?