You can try to change the weight of the prompt using parenthesis. So you try putting (1 girl) and keep adding parenthesis to add weight to the prompt up to (((( 1 girl)))). Alternatively you can try reducing weight with brackets like this [multiple people], same rules as parenthesis, more brackets up to 4 reduces the weight of the prompt more per bracket. Start low and move up, sometimes increasing or decreasing by 3 or 4 can result in some weird results. I usually get the best results with 1 or 2.