Ok Update.... Today I was accidentally walk in to Petland across my work place and ask them for Rats...
Surprisingly (they never have size i want) they actually had two litters of pups and mother with 2 fellows what just pass weaned phase and start small rat phase...
My feeding day should be tomorrow but i decided to buy one of this 2 fellows and try on my stubborn female...
Came back home remove cold size unoccupied hide and water bowl and put with slightly open tub rat still in carton box inside... Browsing BP.net in corner of my eye i saw movement in tube... She sitting with S neck and watching box ...

Ok I told to myself is a good sign so very delicate open tub slightly more... grab box open it grab a rat put in the tub and closed it... All this secrecy is necessary she is skittish one...
Few minutes passed and nothing...
I've took a look inside and.... of course bastardo rat sitting somewhere in corner of the tub and Frigga barricade herself in hide...
I've closed tube again and check the time: was 8.00 pm and told to myself: Hmm that Rat is small (54g actually) i give her little bit more time...

9.22 i heard squeak in her tub.. so i started pray "Please this dont be defensive strike please eat that nice sweet ratty i chose for ya"... 5 minutes later i check very careful on her and she was coiled around a rat

Just Now I checked one more time and....... RAT IS GONE SHE EAT IT !!!!
I'm so relieved.. her weight last week was 960g... I hope that meal will trigger right feeding response now... but for few next feeding I'll try stay with similar size prey...