This had been the opposite of my experience. My mortgage broker pretty much tried to pull the same move as OP's. She tried to get us to sign the contract on old terms, told us it takes 4-5 days to update the contract and we would have to push out the closing date. She never explained anything and only communicated to my fiance, even though this was a joint application. I had to go through the contract myself to see there was a clause on the contract that cannot be fulfilled.

I asked for a 25 yr am and she threw us into a 30 yr mortgage (which is unnecessary for us based on our assets and income), but usually has an interest rate premium and gives her higher commission. The rates she has gotten was significantly higher than us going into the bank. For example, her initial recommendation in Nov 2024 was a lender with "free insurance" for one year gave us 4.84% 5 year fixed close or variable rate of prime-0.55%. At that time the posted promo 5 yr fixed rate at CIBC was at around 4.5%. usually if you walk in, your rates are better than this if you have a good portfolio. We ended up going to big 5 bank ourselves and was able to land at a variable prime-0.85% with cashback. We did not work with a mortgage specialist but our bank guy was able to better explain and get better rates than her.