So the bronchiolitis history is interesting.
The fact that your DD is whinging is very telling. She's trying to tell you something.
If she were on the spectrum, she wouldn't really be doing that. Possibly but probably not. My youngest was a very peaceful, placid little baby... as if he were somewhere else. He was SO quiet, we had to remember he was in the room, it was that extreme. I would call his name and he would never answer. The dog would come running instead. He never pointed. He was always a very affectionate and happy baby but there was a little emotional veil. He was different to our other two.
My point in all of this is, get your little one plugged in to paeds.
Book a telephone consultation with the GP and push hard for a referral. Because the GP won't see your little one right now (because of Covid), do some experiments at home so you can back up your concerns over the phone.
-Clap. Write down your little one's response to the clapping. Do this a few times. Does she look? Does she get scared? Does she seem not to hear the clapping?
-Call her name in the same room. Call her name from another room.
How does she react?
-Engage through play (together on the floor). How does she respond?
-Disengage for one full minute. Does she come to you for attention, noticing that you're not responding to her?
Tell your GP you're concerned about her hearing. Mention the bronchiolitis and how she hasn't seemed right since. She needs her chest listened to, ears checked. Then hearing.
Above all, she could just be going through a phase where she's discovering the more physical side of life and small talk isn't her thing right now.
This too is very common! Other senses and explorations take over. She may be less people-oriented right now as her brain is learning about other things: spacial awareness, physicality, for example. This is normal for children to abandon other areas of learning only to return to them later and with more gusto!