Both clauses are doing sensible things, and both are negotiable.
The protection period stops this: agent shows you a house in March, you let the agreement lapse in April, you buy that same house in May and pay nobody. It only attaches to properties she actually showed or introduced during the term, so it isn't a blanket claim on everything you buy for six months. The two things to fix are the length and the proof. 180 days is long, 60 to 90 is common, ask for it. And ask that any protected property be identified in writing within a few days of the agreement ending, so you get an actual list instead of an argument later about what counts as "introduced."
Dual variable rate is about the seller's side, not yours. Some listing agreements charge the seller one commission when a cooperating broker is involved and a different, lower one when the listing agent handles both sides. That difference gives the listing agent a financial reason to prefer an unrepresented buyer, and the disclosure exists so you know it can happen. Where it matters for you is on a house where the listing brokerage is on both ends.
The exact wording and what has to be disclosed varies by state, so read your version rather than mine, and if the protection period language is dense enough that you're on the fourth read, an hour with a real estate attorney in your state is cheap next to a disputed fee. Ask her to explain both clauses out loud before you sign. If she can't, that's information too.
