There's a group in the area called IndyAP that might be good for you.
It is a very AP/natural-parenting group that is, at the same time, pretty laidback and casual. There are members all over the area, including Greenwood, Irvington, Plainfield, Carmel, Noblesville, Fishers and the whole of Marion county.
Look up in the Groups & Gatherings Indiana thread and if you are interested in joining, PM mamatarax.
It really is a fantastic group...I've never been apart of a better group of supportive and knowledgable mamas!