I think you are worrying too much. Putting things in their mouths is very common for babies that age, so don't stress about it. Even my one year old still 'tastes' everything- books, pencils, pens, toys, blankets, etc., etc. I borrowed books from the library for him to look at, and when I wasn't looking, he ate it up!
I learnt my lesson that day.
So, if you must give her crayons, be around to supervise, otherwise they'll end up in her tummy. Though the crayons may be non-toxic, it may not be safe for her to be eating crayons, same with eating books, like my little chap did. There will come a time when they lose the urge to taste and eat everything, and then you can teach her drawing and give her crayons without having to supervise their use.
I read Dr Gentry's book ‘Raising Confident Readers', and he talks about this very issue of babies wanting to taste stuff. On page 77, he says: ``Book handling begins early with baby's grasping. Baby's touch sensitivity is first developed in the mouth, so expect babies to explore board books with their mouths and their hands''
In other words, get used to the fact that everything will always be tasted first, before it is used. He also explained this concept in an interview that with babies, putting things in their mouth is their natural way to explore things, to learn about them etc. So when a child tastes a book, he learns about the texture, etc.
And about encouraging writing, Gentry recommends several things. It's a very long list on page 87 of his book, but I list a few such as
1. Guide babies in marking marks with markers
2. Model drawing
3. Draw something together
4. Draw while you tell your child a story
5. Take turns using crayons
6 Think of your baby's joy or fascination with smearing food as a cue to introduce art
and so on
So in a nutshell, my advice would be to encourage drawing, but ensure that drawing sessions are properly supervised. And don’t get frustrated that she prefers them in her mouth than on the paper. According to Gentry, that’s how babies learn about things -by tasting them first.
Enjoy your daughter!
EDIT: Below is the link to Dr Gentry's interview which I talked about. After listening to Gentry's response to the interviewer's question about her son's book-chewing tendencies , I made peace with my child's tendency to 'taste' stuff.
http://www.youtube.com/v/93J5NjUxPeI&rel=1 And more interviews by Gentry can be found on his youtube channel:
http://www.youtube.com/user/RaisingGentryReaders/videos