Thank you for your query.
Swollen and bleeding gums
can be the cause of bad breath that you have mentioned. You can make your daughter rinse her mouth with cold water frequently to reduce the bleeding from the gums. Ensure that her brushing is proper and consult a dentist
Since your daughter is having temperature, is groggy and having stomach cramps
then an intestinal infection needs to be ruled out. It is advised that you consult a child specialist/pediatrician
Wishing your daughter an early recovery.