Hi Benjamin,
So far, the fact that she replies fast when you text and that she added you to her private snapchat story and even sent you a live pic of her out of the blue in the middle of a conversation, does not necessarily indicate that she is interested in you.
In other words, none of these acts really stand out of the ordinary.
If she rarely asks questions when the both of you chat, it could be because she isn’t a particularly good talker.
She may be more comfortable in reacting than in instigating.
This doesn’t really indicate whether she is interested in you or not.
However, a way that you can go about determining whether she is interested in you is by flirting with her.
Oftentimes, when a girl likes you, she will respond to the flirt and even start initiating it as time goes on.
If she is not interested in you, she will have a lackluster response to the flirt and she most certainly won’t start initiating it as time goes on.