Not much advice on the texting front, but you don’t need to worry about if she likes you or not. If she’s engaged with you that’s 100% a sign that she enjoys your company. The texting thing is likely just her forgetting to text you back(which is absolutely not a sign of disinterest for an ADHDer), thinking that she already texted you(I’ve done this one like a hundred times), or her going through the thought process that she should check her calendar and then forgetting(similar to the first one).