H M., I bet all those sirens and noise were quite stressful/scary for her, at least, it sounds like she is exhibiting signs like that. I would give it some time. Like any other event that can create stress for the little ones, sometimes they "regress" to needing more comfort after being more independent ---
for example --- when a baby wants to nurse more while they are teething even if they are primarilly eating solid foods and drinking out of a cup. (my son, 18 months)
I believe in consistency in general but also like to take into account if there are extenuating circumstances (sirens, teething) that might change a baby's general reactions or behavior.
One thing - is she talking yet? the whole sirens in the middle of the night - espeecially if you yourself were scared and anxious - might have thrown her otherwise safe and predictable night-time world for a loop. If she is reading stories with you - you might want to think about checking out some storm/tornado books from the library to explain WHY there were sirens, and how you reacted.
Another thought perhaps - take her by a fire station and/or point out when sirens go off when you are driving down the street - we hear a lot of sirens where we live in Lex. just because we are close to 3 hospitals so I don't think my boy reacts as much to that except to note an ambulance or firetruck is going by. If you can show her the source of the noise - and then tell her something that she can understand about why they are making it that also might reassure her some.
Other than that - why not let her fall asleep with you for a week or so - but continue to place her in her own crib once she's asleep so that she wakes up there. also - you could give her some play-time in the middle of the day in the crib so that she can get used to it again and not feel like it is a scary place to be at night but more familiar.
Just some thoughts. good luck!