1. Put the cricket tub into the viv and open it a little bit, then shake it to get a few crickets out. Yes, you will get some escapees, it's just how things go
2. If she's tiny, great big crickets might be too big for her - I let mine eat as much as they want as long as it's INSECTS.
3. Where is your thermostat probe located in the tank? You ideally want a basking temperature around 120 to 130 degrees Fahrenheit (sorry, I don't work in Celsius) - but you'll need to position your probe so you get the right basking temperature AND you get a cool area in the viv.
4. I very rarely pick up my ackies - I let them come investigate me or climb on my hands. I don't want them to associate my hands with being grabbed and held bodily any more than necessary.