Not only is it not a problem, but it's a "plus" that she is completely used to f/t prey. I'm sure she was raised that way, rat snakes are EASY to feed, nothing like BPs.
Consider it a blessing that she is content to just eat, not tackle her prey. Their instincts when they hatch serve them well, & initially they will go "thru the motions" to
constrict, especially if their first food is a live pinkie...but when fed f/t mice, most rat snakes learn VERY quickly that constriction is just not necessary. Please NEVER
give your snake live prey to see what happens, because she could easily get hurt (if it's a mouse of any size with eyes open, they fight back by biting). You should be
content: you have what many would be happy to trade for...a snake that is perfectly happy just to eat f/t prey, no fuss! She actually HAS learned...not to waste her
time & effort killing food that's always dead. And she is likely a calmer pet to handle because of this, don't fix what isn't broken, lol.