This sounds so similar to a 4 year old girl I treated using the Lidcombe. I am not formally trained in the Lidcombe and had to go off of the manual that I had, but I did a lot of structured play using toys/activities that were of high interest - in her case it was play doh, play food (feeding a puppet), Little People playsets. Things that had a lot of pieces and a lot of opportunities for language. I also used the Snooky Snail game boards and workbook activities by Super Duper and worked the Lidcombe stuff into that. Some of the Super Duper fun decks were helpful too to elicit longer utterances, like the "What Doesn't Belong", wh-questions, go-togethers. The little girl I worked with also really liked absurdities/what's wrong with this picture activities. It got her laughing and she loved to tell what was silly about the picture. Good news is that the program really worked for her and the parents were really invested in it and dedicated to carrying it over at home. Hope that helps!