Is this weird? HELP! So, I recently received a letter from a girl in my own country. The letters just take 3 hours to deliver to each other. She sent me the first letter yesterday, which by all means is a normal letter. But today our fifth(in total) letter in - she doesn't talk about the stuff or respond to the questions in my previous letter. But rather she starts talking about how, we both have similar tastes, like and dislikes and she starts talking about love, rather deeply. She talks about her past experiences and says she is a one man type of woman. We don't know much about each other, but that letter really weirded me out. Is it normal for people to send such letter. 
I have like 5 active penpals and we haven't talked about such stuff at all especially in such detail. Is it weird or am I just being silly and paranoid? Any help is welcome.