She probably knows you are shy and obviously still likes you and wants to chat, so if you think she feels put off by your silence because you don't know what to say maybe try being straightforward and actually say to her, sorry when I go silent after you text me or want to talk I don't always know what to say back but it doesn't mean I am not interested in talking with you, I enjoy spending time with you.
“The world would be a nicer place if everyone had the ability to love as unconditionally as a dog.”