6 month old bp threw up

[Craiga 01453]

I bought it from a snake breeder that's been breeding snakes for decades near my town...I have had the snake for 6 to 7 months now... using heat lamps, 2 lamps on one side of tank, both red lamps, side with lamps is 90 degrees according to stick on temp and humidity gauge and I also have a temp and humidity on other side of tank both are in the bottom corner of the tank.....20 gallon tank, been feeding large frozen mice, thawed then warmed under hot water in a bag, she has been eating the large mice for a couple if months now...I put tin foil over top of cage to keep heat in and moisture in due to the screen top...maybe I should get heat lamp for other side of tank as well.
When she eats mouse is gone in a couple of minutes doesnt seem to be struggling when eat,

Are your heat sources regulated by thermostats????

And those stick on analog thermometers are unfortunately wildly inaccurate. They can be off by as much as 15°.
I would definitely advise getting a decent digital thermometer/hygrometer