Mortgage broker commission

Hey guys, I am in the process of purchasing my first home ($550k) with 5% down or 10% down. I've contacted RBC and CIBC before and they couldn't lend more than $400k ($450k on a case by case), which means I'd have to put down 20% down payment.

My annual salary is $100k (+commissions but nothing to show yet). Last t4 income was 200k+ and 300k+. Very good credit score 

I am working with a broker and she said she could get 5% or 10% done with A lenders (big 5 banks). I guess she has good relationships to get it over the line instead of taking me to a B lender

She said commission would be 1 to 1.5%. I tried to clarify but she wasn't willing to 'haggle' and she said it could be anywhere in that range. I didn't understand why she wasn't giving me a straight answer. To be perfectly clear, I wasn't even haggling. Not sure if this is on top of 'lender' fee, which should be 0 in this case if it's A lender. Is 1% or 1.5% too high? I thought it'd be 0.5%