Realtor listing agent issue

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Just a quick question...

Yesterday I got a call from a Realtor who put a property for rent on the MLS on behalf of her client. Her client now wants to sell through a short sale. So the Realtor called us and she wants us to buy the property through a short sale. Great so far...

I'd like to use the Realtor as the sellers agent and our buyers agent (from the A to the B). and become our listing agent again (from the B to the C). I'd like to know if this is possible if she already put a property for rent on the MLS on behalf of her client?

I know its not possible when the Realtor put a property on the MLS for sale on behalf of the seller. But does the fact that the Realtor put the property on the MLS for rent change anything?