Poor Betsy - Bella had endless ear infections in her first year. She was literally at the vet's every other week for more antibiotics, ear drops, ear cleaning stuff, you name it. Thornits didn't seem to work for her really either and the poor thing was getting so miserable being pinned down day after day for ear drops.
This was one of the main reasons I switched her to BARF in November 2005 (that plus anal gland problems). I can hand on heart say that since that day in 2005 when she had her first chicken wing, she has not had a SINGLE ear infection. I rarely even need to use a cleaner on her ears (can't even remember the last time I did them it's been that long) and the last time the vet looked down them he said "Wow, I can see almost to the bottom of her ear canal which is pretty amazing for a cocker".
I was a bit sceptical about BARF being a miracle cure but decided after alot of reading to give Bella a 3 month trial and see how it went. I never looked back - she'd also been starting to get eye infections pre-BARF but these also stopped.
Basically pre-BARF we were at the vet's literally once a fortnight, and post-BARF (in 2 and a half years) we have been once for a ripped claw and twice for her boosters.
So my experience has been wholly positive. Zorro's been on it since 11 weeks and hasn't had any trips to the vets either.
He does have excess wax in his ears and I'm sure if he were on kibble we'd have lots of infections, but as it is, he's never had to have eardrops and he'll be two in August.
So IMO I'd say definitely give Betsy a go on it - if it doesn't work out then you can always go back to the JWB so you have nothing to lose.