Easily found info. All college rosters are on the college's athletics web site somewhere, and a roster head count shows where they recruit from.
First of all, don't count on PAC Ten schools coming east to recruit. Why should they? The number of girls playing softball there FAR outnumbers Ohio and surrounding states, and thus the number of quality recruits.
Secondly, it's not that Ohio girls are getting inferior instruction vs. Cali girls (although I've witnessed some pretty poor teaching here in Ohio) - it's a matter of sheer numbers. Cali girls come East because of the opportunity that's not available closer to home for them.
IMO, breaking into the Big 10 (11) is an outstanding accomplishment for an Ohio girl - especially a pitcher. I just don't think the PAC Ten is a realistic goal for Ohio kids - unless the family moved there and the girl really busted her tail to beat out the natives.