Time Out

[rocky50]

This was a 7th grade girl’s basketball game. The ball was thrown in bounds under the basket in the back court (no defenders nearby). The player after taking a few dribbles somehow lost the ball and it started to rollout of bounds. Before the ball was out of bounds her coach called time out and my partner granted the time out. The opposing coach complained saying that she has to have possession before a time out can be granted. What is the ruling on this and where would I find it in the rules book?

Thanks