I wasn't expected to go in until I felt ready basically each time - the guide they say is not until 3 good contractions in 10 mins or not managing the pain... and that included second time around where I counted as 'high risk' because of the previous CS
The medication.... I would say her partner would be in charge of that, no ? But if she puts it in her birth plan and makes sure someone is aware when she arrives it should be ok
Like I said - my first birth went against absolutely everything I hoped for - and it was still a positive experience! Even down to them offering to put music on in the operating room 
Second was in a whole nother league - I felt so amazingly supported and positive throughout, ALL of the staff were amazing... I don't know if that is because I was expecting it understaffed etc because of the snow or what? They actually recommended I came in before I was in extablished labour second time around as they didn't want me getting stuck at home (the blizzard was due that day) and they knew I had been in latent labour for days... I can clearly remember at least 4 members of staff from that labour which I will remember their care until the day I die - I can't remember their names (rubbish with names!) but there was the anaesthetist - Neil ... his NHS card had his job title down as 'supa nice guy' he's a trainer there too, he was amazing, kept me so relaxed even when the epi wasn't working and they needed to put me out, made me laugh, took pics of DS emerging for us - the lot! A fab midwife who was little, short hair, scottish - she was amazing... completely there for ME as well as baby... when she could see I was at the point of being frazzled (days in labour) she got me in the shower, washed me (!), got me changed, and got me a shot of pethedine and basically forced me to get an hour or two sleep - my god did I feel better after that... she rubbed my back when DH needed the loo, she was brilliant,
then there was a lovely young midwife, who had got stuck there in the snow, she was there when I was first admitted and then she was back when the scottish lady came off shift - she was so friendly and lovely, even though she hadn't been home. She was also in to help on the surgery and passed DS to DH after he was checked
Post natally - there was one particular midwife who was fab, she was so kind to me when I hit 2nd night hell... really patient, completely 'got' the hell of emotion / exhaustion that night can bring - and just a chat with her got me through the night... she even arranged me a cuppa -and basically advised me to sod the advice, to get through 2nd night just keep baby on me - I love her for that
Even though I always remember those 4, there was not one member of staff who was 'bad'!
The only things I would recommend is make it clear what she would like... IE in birth plan put - in case of CS I would like skin to skin asap (I was able to have it with both, they even paused the op second time so I could have some before they put me out and stitched me up)... I would like music, I would like DH to be able to 'cut' the cord etc etc
They are really really good at helping to make it a positive experience... promise!