First egg and then no more??

If she just goes in and out she may just still be trying them out for size. It can be an indication of egg binding. Does she act distressed, cloaca pulsing or making unusual noises? Those are signs too. If not, I wouldn't worry.
It takes a while to get eggs regularly. Youngsters ovulation isn't regular.
If you really suspect egg binding. Give the pullet a hot bath massaging the abdomen and then lubricate the vent with your finger dipped in olive oil or some other good lubricant - nothing mineral.

 

I'd give it a few days..new layers are not always consistent and they can act really goofy when they first start laying.
It can take up to a month or so for them to get things really rolling, and you may see some funky eggs and behavior during that time.

Some birds don't lay every day, but only a few times week.

What breed is she?
As long as she's active and moving around OK, she's probably not egg bound.