When she first woke at 12am I went in and gave her nurofen and snuffle babe on her chest so realistically she shouldn't need any medicine.
Was the nurofen on an empty stomach as that can cause stomach pains & it's not really good practice & that may be why she woke another time
we have initially done some sleep training where she's CIO for a short time
On BW we really don't condone CIO as it breaks the trust the child has in the parent being there for them. It is hard when they don't settle easily but it's also very confusing for them why sometimes they get their cries answered & other times they don't, so it acutally means they will cry more.
It is normal for babies & toddlers to go through lighter sleep cycles & wake if things like teeth or illness come into play they wake for longer periods & if it's night terrors she really wouldn't respond to you & if it's SA then actually going into her & showing you do respond to her needs is an important long term action. Esp now as she was left to sleep in the wet.
Rather than going in & giving her a cuddle you are probably better going in (in the dark) & softly telling her "Mummy's here, time for sleep" & just repeating it, trying not to hold her, but if she needs it just putting an arm on her chest if she is lying down or if she is standing, gently lying her down & if she stops crying when you turn up, just keep reminding her "it's sleep time.
I'd be inclined to think if she's been a good sleeper then it's illness & teeth & "this too will pass" but please don't leave her crying, you wouldn't leave a friend to cry alone would you, so honestly I don't think it's fair to do it to a baby even if it is in the middle of the night.