Hope she feels better soon

39.9 would have me worried, but it sounds like you have it under control with the Calpol now?
Keep checking her temp often to make sure it doesn't get back up there. I'd call someone if you can't keep it down or you notice any other odd symtoms.
From:
http://www.betterhealth.vic.gov.au/bhcv ... r_childrenWhen to see your doctorTrust your own instincts, but seek medical help if your child:
Is aged six months or less
Has a rash
Has a fever of 40°C or more
Is still feverish after a day or so, despite four-hourly doses of baby paracetamol
Vomits or has persistent diarrhoea
Refuses food or drink
Cries inconsolably
Seems listless, floppy or just looks ill
Convulses or twitches
Has trouble breathing
Is in pain
If you feel at all worried or concerned at any stage, consult with your doctor.
Treatment for a fever Dress your child in light clothing.
Give drinks of clear fluid (like water).
Keep your child cool.
Give paracetamol in the correct dose for the child’s age (but not more than four doses in a 24-hour period). Do not give regular paracetamol medicine for more than 24 hours without seeking advice from your doctor.
See your doctor if your child is three months or younger.
Don't give your child a cold bath. Give a lukewarm bath or sponge. Cold water cools the skin but does not lower the body temperature.