Italian to English Medical Medical (general)

This is from a journal article about a little girl who, it turns out, had accidentally ingested lorazepam and presented in A&E with ataxia.

The tone of the journal article is strange! The author is sarcastic and tongue-in-cheek and clearly doesn't think much of the parents who he had to persuade repeatedly to reveal if she could have taken anything. The parents did seemingly try to cover it up, suggesting she had taken another more innocuous drug at first.

I don't have an issue understanding the individual parts of this sentence, per se, but put together, I can't work out what the author is trying to say.

XXX viene tenuta in osservazione una notte, la mattina dopo sta meglio, riprende a camminare, a mangiare regolarmente e comportarsi abitualmente (ovvero a entrare in tutti gli ambulatori del Pronto Soccorso afferrando ciò che trova, forse mentre il padre è in bagno e la mamma prende le gocce).

So: XXX was kept under observation overnight; the following morning she had improved, was starting to walk again, to eat normally and behave like her normal self...

It's here I get a bit confused. She was "walking around the different areas of the ED picking up anything she could find, whilst the father was in the toilet and the mother was "taking the drops". Is "prendere le gocce" an idiom? Drops of what?

Any help greatly appreciated - sorry for the essay!