As for my toddler following instructions is very challenging as well most likely the same as any other toddler with the same age as ours. My daughter is our first born she spends majority of her time at home with me and we rarely go out to socialize as well. She likes solitary play and when we do get a chance to go out and socialize she likes doing parallel play. When we ask her questions she is just now comprehending on how to answer them properly but we still do alot of prompting as to what the correct answer to the question will be!
I’m a special ed teacher and the word “abnormal” isn’t really typically used anymore!😞 if you think these behaviors have been a pattern, have you brought it up to her pediatrician? I believe every well child checkup they have, you would have to answer an ASQ (ages and stages questionnaire) and then it would kind of give the ped an idea of where your child is currently at in different areas of development. If you are still concerned about hearing daycare teachers/swim teachers mentioning the phrase “in her own world” bring that up to her pediatrician and then hopefully he or she will give you a referral to get her tested! Hope it makes sense!