Do yourself and your Realtor(Jane), a favor and sign an exclusive Broker/Buyer Agreement with her/him. The beauty of this agreement is that it will settle once and for all, who's client you (The actual buyer) is. I love this document for just this reason. I think its commendable that you are loyal to your Realtor and I'm sure Jane will be happy too. Your Mom should call, Suzanne and explain the situation as well.
You are free to work with whomever you choose at this point. The fact that an agent (Suzanne) showed properties to your mother, does not constitute procuring cause for that agent should you purchase one of those properties. If the agent (Suzanne) showed the properties personally to you, then that would of course be a different story. If you signed a exclusive buyer's agreement with Suzanne, allowing your mother to be shown properties, this would also change things. If your mother signed one, then it's between your mother and the agent - not you.
Whether or not it is "fair" to Suzanne is arguable. One could argue that it would be "fair" to Suzanne to get paid the commission - since she did a lot of work already. On the other hand, a lot of agents would never agree to spend time showing properties to a "3rd party" on behalf of the actual buyer, for this very reason.
The bottom line is you are not obligated to any one agent here, and are free to work with the agent of your choosing.
Hope that helps!
I agree with the others. You are not bound by the actions of other people, including close relatives like your mother.
However, I would suggest this might be a good time to sit down and have a long chat with your mother. She is well-intentioned, but like a lot of moms and dads, she seems to be having a little trouble letting go. I would assure her that you will always love her and value her advice. But gently note that you plan to make your own decisions from now on and you expect her to respect the fact that you the strong and capable adult she raised you to be.
(Please don't call me Dear Abby!)
Happy house hunting,