Hi Benjamin,
Thank you for your kind comment and I am glad that the videos have helped you.
A good way to ask her if that snap was only meant to be sent to you is to make a comment in acknowledgment of the snap and then ask her about how everybody else she sent it to reacted to it.
By asking her in this way, you are able to get her to let you know whether she also sent that snap to her friends without giving anything away as far as what you are hoping for.
If she sent it to her friends as well, she will proceed to let you know how some of them reacted to it.
If she only sent that snap to you, she will let you know that you were the only one that she sent it to.