Im an early interventionist and would also echo those who have suggested an eval, 'just to be on the safe side'.....but Id like to say also that the stress and trauma can ABSOLUTELY have played a big part in all of this.
In fact, these things really stand out in my mind--
1--your DD really does seem to have all the good 'precursors' to the next developmental steps such as in language, and seems to be continuing to 'move along'
2---your own wisdom about this really shines through in your post, and I trust it. (It seems like you do too,....seems like you know your DD so well, and really understand how things have impacted her.)
Perhaps (whether you do an eval or not) getting back to some wonderful cozy routines, and spending some extra child-guided loving attention and time together would be the cushion she needs to be on her developmental way.
extreme or longlasting stresses, or trauma of any kind, (illness, hospitalizations, divorce, separation, etc....) can
very much cause developmental set backs for children.
development is vulnerable. and even a child as young as your DD was at the time will 'self protect' by holding back temporarily when faced with stressors and difficulties.
(think of a child learning to use the potty, then suddenly there is a divorce or separation of some kind.....of course you might expect the whole toiletting thing would be put 'on hold' by the child...seems natural, right?) ....its not really all that different with other aspects of development, either.
your instincts seem RIGHT ON TARGET to me. again, might be good to go for an eval just to be sure, but routines, lots of cuddling and 'safe' feeling time together, (maybe you even have some pictures of her during that time that you could look at together and talk about in simple terms. just a thought,...dont know if youd feel that would work or be appropriate...) ....these are the things that I would think would help the most, assuming there really isnt any other real reasons for the 'delay' going on.
doesnt sound like you would be taking on guilt about this, thank goodness. life will always be full of stressors for us and our dear little ones. the key is how did we handle it at the time, and, if we were unfortunately 'unavailable' to handle it our best at the time, how can we help to 'destress' and build that safe cushion again afterward, so we can all move on.
the best to you, mama. you sound very in tune with your dear little one. hope all goes well for you.