i would suggest no, not unless you totally trust her. try to check reliable real estates agents and company

Intermediary is not a usual term – the usual term is buyer’s agent.
Normally this involves an agent doing the leg work and research to find you homes that are in your price range and fit your criteria, and then guiding you through the buying and closing process as well as negotiating the offer for you.
You do not pay for this, the seller of the home you eventually buy pays a commission.

Decide if you like and trust this person and if so she can save you a lot of time and money by working for your best interests.

NEVER ever accept anyone as a “legal” intermediary. know that the duties of a broker depend on whom
the broker represents. If you are a prospective
seller or landlord (owner) or a prospective buyer or
tenant (buyer), you should know that the broker who lists
the property for sale or lease is the owner’s agent. A
broker who acts as a subagent represents the owner in
cooperation with the listing broker. A broker who acts as
a buyer’s agent represents the buyer. A broker may act as
an intermediary between the parties if the parties
consent in writing. A broker can assist you in locating a
property, preparing a contract or lease, or obtaining
financing without representing
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a buyer should never ever accept anyone but a buyer’s agent.

a buyer’s agent acts like an attorney, ADVISING and negotiating. [paid for by the seller]

an intermediary is a totally neutral party–WORTHLESS when buying real estate.

[fact; in the past 40 yrs, buyers have overpaid by 15% average, on properties
bought when dual agency OR intermediaries was/were accepted by the buyer
because NEITHER one is permitted by law, to negotiate for the buyer!!!