Your Chaplain reads the weather? I had never heard of anything like that before.
But to each her own...
One way for your Chaplain to become more involved is for her to plan events (such as Bible studies, group outings to Praise and Worship events and the like, or swaps with other religious organizations [Jocelyn put it very well]).
I am sure that if you just get the word out (in meeting would probably be good) that the Chaplain is someone to listen to and counsel other sisters, other girls would start going to her as someone to talk to. You might also want to amend your bylaws to include the newly defined duties of Chaplain.