Everything everyone else said is true and I hope you take it into account.
Since I didn't see it mentioned yet, I would not be feeding medium rats to a pet BP, and only ever at certain times of the season for a very large breeder BP female. Yours already looks obese and it's only going to get worse feeding mediums.
Telling yourself you have the experience to do it safely the paragraph following explaining that you put a frog in an enclosure with a garter... this is colubrid 101 really, that they eat frogs. I'm not trying to be mean, I'm really not, but you need to take a step back an re-evaluate what you think you know. The only person you are fooling is yourself and people with practically no experience whatsoever, and unfortunately a lot of those people are uneducated enough to try it anyway because they read stories like yours and can't tell you don't know what you are doing. If anyone in this thread comes off as harsh, you have to understand that we MUST point this stuff out to deter others from repeating these mistakes, whether or not you listen to anything said. This gross failure presented as a success cannot be allowed to be platformed without serious criticism.