Oh the joy of a first snake... more like HELL! Its so stressful if they miss a meal, or wont stay on hotspot! Just dont worry, Dont offer her rats every couple days. or mice, whichever feeding but offer sporadically, so your not training her to refuse. If they decline first meal (i do with hatchlings) i offer like this
day 3
day 11
day 14
day 21
day 35... So on, try to keep it different, vs day 4/8/12/16
Aswell a nice trick is if u have 1 snake, leave rat out to dethaw (not in water/bag) and let the "scent" urge snake to gain a better feed response, place infront of cage or on top, I use to even place in a lid deli cup (like cricket holder with holes) inside cage so my lil guy would smell, by the time i came home zapped with hair dryer he took it ASAP. (often wet rats push snakes away, at least 70% of mine wont take a rat directly in water) But theres 100's of ways to trick them!