My nt Ds was completely unaware he was soaked to the skin until he was about ten. Wet pants just don't bother him. He also will sleep through the night having wet the bed. Being wet just isn't an issue for him.
I think most 2yos will know if they are unhappy or grumpy (ie they are mothering or bawling) but not have the wherewithawl to recognise a particular cause and identify it, and try to solve it by working out what they need. 
The said 10 yo is horrific when he's hungry, but he doesn't recognise that as the issue. We do.
The thing with developmental delays, is that they work on a completely different timescale to everyone else, so comparisons are pointless. You just need to identify delays and try to work on them... Dd2 was a reet pain - it's very common to spend two hars working on a particular skill (ie sitting independently or moving an object across the midline) and fail miserably. Then you all cry, give up because she's never going to be able to do it, and the blooming kid will just magically learn the next week.
We were told that dd2 wouldn't walk or talk. She is 9 now and walks, runs, skis, dances, sings (tunelessly), shouts, argues with her brother and sister incessantly, and is generally a regular 9yo (but with cerebral palsy). She missed every milestone known to man by months for the very early baby stuff (she didn't smile until past six months, laughing was well past a year) and years for gross and fine motor... She's a pretty functional 9 yo though. And can even do stairs! 
It takes a long time to come to terms with the fact that kids with delays work to their own schedule, and it's hard. There's no need to hide yourself or them away, the more you can face getting out and about into the community and toddler groups the better, but there will also be an sn baby and toddler group around (and if there isn't start making noise and start one, whilst bugging her therapists for professional support services - dd2 had a feeding specialist SLT and a physio who visited our sn baby and toddler group).
And be kind to yourself. This is normal. It really is. To be comparing your dd to a predetermined list of abilities is to suggest she isn't. You just need to adjust your 'normal' radar. 
And be kind to yourself. Disability lasts forever. Tis impossible to rush, so you may as well slow down and smell the flowers and have an extra cup of coffee.
What sort of sn has been dx with, as a matter of interest? Or is it just a developmental delay tag at the mo?