Which is more appropriate in this circumstance – or are they equally relevant?

Now, consider the following case that illustrates ethical considerations in business –
The Shoe Store
The shoe store is one of many located in the metro area. This one is sited in a mall serving the suburban area of the city.
The store manager is Bob. Bob calls you, his boss, with this situation:
About an hour ago, the stores best customer walked in. Imelda is a shoe maven, and she buys more shoes than anyone – dozens of pair per year, both for herself and for her friends. She looked around the displays for a while, then came to Bob and quietly asked if there was an employee available to help her get the proper fitting for her shoes. Bob explained that Tom, a sales employee, was working “the front” today, and Tom would be happy to help her. He has great experience and a good track record with fitting women customers with shoes that not only look good, but also feel good with hours of standing. Tom is eager to serve Imelda, and looks forward to the commission sale.
Imelda got a pained look on her face and said shed prefer a female employee helping her, and she would come back in an hour after doing other shopping. She explained that if there was a female employee there to help her, shed probably buy five pair of shoes, and then she left the store.
Bob explained that Mary, another sales employee, is working the back room today. Each day, there are two employees in the store: one works the front, and one works the back. They rotate on a daily basis, because the one working the front gets the commissions for the day, and the one in the back doesnt. Thats company policy from the very top, and neither Bob nor you have the flexibility to change that policy – so theres no chance to split commissions, etc. Today is Toms day to earn commissions on top of the hourly salary he and Mary both receive.
Bob asks you what he should do. Should Bob swap Tom and Mary so that the store gets the benefit of Imeldas purchases, or should he stand firm that Tom is available to sell her shoes, and if she doesnt want to purchase from Tom, she certainly doesnt have to?
What ethical principles guide this decision? What would be considered in a Teleological analysis of the ethical question here? What would be considered in a Deontological analysis? Which is more appropriate in this circumstance – or are they equally relevant?