I personally think that your silence makes her uneasy and insecure. Possibly it makes her feel as if you are mad at her, or makes her feel as if you are detached from her. She may believe that, if you were talking to her you would be opening up/bonding with her.
Couples dont converse every minute that they are awake. Lol, eventually, after the honeymoon period is over (3 to 6 months) you've explored everything new and it's time to relax and chill.
If I were in your shoes I would be asking myself - is this something that we are incompatible on? If you are not a talker, and she needs that, this might end up being a bone of contention. You just need to let her know that nothing is wrong, you just dont vomit words from the mouth 24/7 and, if she really wants you to be comfortable in the relationship, she needs to understand that and back off. Then, if you are so willing, try to engage her a bit more than you have been.