She will get the hang of it soon. Labs are smart dogs. It helps to have tiny training treats in your pocket and when she goes outside there’s the reward. Now about the story when my lab helped herself to a dessert buffet at a party.....
Well, our two "furry kids" are not Labs, but Miniature Schnauzers weren't hiding under the bed when brains were passed out either! On the advice of the breeder we got two of our girls from, we took them out every two hours...on the dot. When they did their "pee job," they got a treat and profuse praise. "Accidents" (of which we had only 2-3 total) were treated with a moderate scolding and an immediate trip outside. If they did another pee job out there, they got a treat and praise. It didn't take long for them to figure things out.
Getting them onto a regular schedule worked very well. In short order, they would go to the door every two hours. As they got older, we stretched the time period a bit. We still take them out about every four hours until bed time. They have no problem with skipping one pee break in the middle of the night.
Neal have seen that our Miss Daisy rings the little bells we keep by the door every time she has to go out.
It was very easy to train all our dogs (Doris did it). Every time we took her out, held her paw and hit the bells. Very soon she associates ringing the bells with going out. It works in the house and the RV.