AFAIK there isn't any 'Bengali' restaurant on Devon anymore (
Sonargaon closed).
There is the more recent,
Radhuni which is not on Devon (and I haven't been to). Note also that although Radhuni is operated by Bangladeshi proprietors, the food isn't Bengali as such - more Moghlai oriented. Perhaps a call ahead may result in items not otherwise on the menu.
Actually, she would probably be very satisfied with restaurants on Devon -
Khan BBQ (if she's Bengali, she's not vegetarian, so Khan's won't be a problem). I'm not sure about ambience given that she's a job candidate - but the post-fire Khan's should be okay. Hopefully others will chime in on this aspect.
Also on Oakley just north of Devon, there's a Bengali 'fish' (frozen) and grocery store. In a refrigerator case they carry at times 'misti doi' ('sweet yogurt', a traditional Bengali dessert/sweet) that's flavored with (date)palm jaggery. I would actually not recommend it, unless she has a deep hankering for something specifically Bengali and the other Indian items on Devon don't particularly satisfy (which I doubt, given your statement about rural MI). The misti doi at it's freshest there (from NY) is a poor example (though arguably nearly as good as may be found in many places In India but outside Bengal that may have it).
For dessert I would suggest
Ambala - they carry
rossogollas (another famous Bengali sweet) - and when I visited them last, towards the end of Summer last year they were sold by the piece/weight (as opposed to boxes from the refrigerator). These are actually good examples of rossogollas - IMO better than what may be found in many places In India outside Bengal (and some bad ones in Bengal). The jalebis, if fresh, are also good.
Speaking of jalebis - show her this
Jalebis in Calcutta (youtube link)
(something I managed to get done some time back but didn't have till now an opportune moment to post...)
Brian, welcome to LTHForum! I hope you'll post on where you end up and how the food was.