You need to give benadryl right away, what does she weigh?
This sounds like an allergy reaction-a snake bite may leave 2 puncture wounds right next to each other-you can look for an area of swelling as well. Give benadryl 25mg- 1 1/4 tablets by mouth every 8 hours for the next few days. If your baby continues to have this reaction with no improvement she needs to see a vet for further treatment. There may be an emergency clinic in your area. If you suspect a poisonous snake she should be sen by a vet ASAP.
Make sure her gums are pink!