I don’t see last year’s data for Grinnell (strangely, there is no data for '17-'18 or '18-'19,) but it admitted 97 from the WL three years ago. This year, the list here on CC apparently indicates that Grinnell is closed “for internationals" (is it open for citizens?) Last year, in addition to Bates, Wes also admitted zero from waitlist. http://talk.qa.collegeconfidential.com/college-admissions/2141097-what-waitlists-are-active-who-has-closed-their-waitlists-p12.html Post #74 has the latest info.
It doesn’t mean much though. They are all very selective and we’re splitting hairs. All are great schools.
OP, we’d love to hear how your daughter is leaning.