Dear Alexey,
You would not make a very good detective! It seems to me that Ada is being more than slightly evasive. I read it this way:
Q: What did you actually do with the poor worms, after Krolik's untimely end? (the interrogator is probably Van who suspects Ada of several murders, Krolik's most likely the first)
R: [1] 'Oh, set them free' (big vague gesture),
[or 2] turned them out,
[or 3] put them back onto suitable plants,
[or 4] buried them in the pupal state,
[or 5] told them to run along, while the birds are not looking - or, alas, feigning not to be looking..."
That seems to be five different things she actually did with the poor worms! However I think there are only two (1, 2, 3, and 5 being basically the same) and (4). Which do you believe?
Personally, I think she buried them (4) but not in the pupal state. She buried them larvaely ("poor worms") with Krolik's still live body.
Carolyn
p.s.
Q: By the way, what kind of bird is it that can feign not to be looking! R: A cat?