The way the feeder is thawed, warmed up can play a role, most importantly it's a game of patience and tough love.
With a year old animal assuming she has a good body weight it can take MONTHS, that means offering F/T and not offering live if the animal refuses.
Of course at some point you have to use common sense and know when to stop because tough love cannot go on forever either.
I had a female that took 3 years to convert doing 3 months of though love at the time (I really id not want to push it more also I could have), what finally did the trick is that I bred the female and she laid eggs, usually after laying they will eat ANYTHING.
Every animal is different some will never switch some will switch back and forth from a month to another (usually those are very agressive feeders)
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