Model (professional)

I am currently looking for a new roommate, and last week posted an ad on craigslist. This was one of the responses I got:

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From : Mary Gibson
Sent : 13 September 2006 21:14:32
Subject : ROOM

Hello ,
I am Mary gibson and i am 25 years old.I am interested in your house
for rent.I am a very tolerant person .I dont interfare into other
peoples matters.I like to respect their rules of the house. i don't do
drugs.I am a model(professional). Please you could email me back or
if you have a yahoo messenger you could add me to your messenger list my
yahoo address is (reachmarygibson@yahoo.com) . i look forward to hearing
back from you.ASAP.
Mary
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Now, I wasn't all too sure about Mary Gibson. She didn't sound quite right to me. So I replied from my hotmail (junk) account asking for a few more details, and this was the response:

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From : Mary Gibson
Sent : 14 September 2006 22:24:43
Subject : Re: ROOM

Hello claire,
Thanks for the mail and i appreciate your efforts towards this .I am interested in renting your room.I will need more info from you regards to the house and also i need to know the deposit that i will be paying before i arrive,i am from ENGLAND,but currently based in west africa now with my mom because she works for a missionary school and she is posted down here,i want to move over to the US,Kindly get back to me ASAP with the deposit i need to pay because i will like to pay for the deposit before my arrival and i will like to know the total amount i will be paying for a whole year but i will like to pay the deposit first of all,I do part time modelling and also i have finished with my masters programme.I do model and i have job offers already in the US,I have my masters degree in accounting.My job will be based on contracts so i do not have to go to work all the time,I will only need to go to work 3 times in a week.

Well, i think we will get along well because am a easy going person,like i said i dont do drugs or smoke but i drink only occasionally.I will be glad if you have a Yahoo messenger (reachmarygibson@yahoo.com) so we can chat and talk more and get to know each other better, its free,Send me ur email addy

.Please kindly get back to me ASAP.Hope to hear from you soon.

Mary
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Why is Mary so interested in paying the deposit? And how does she expect to get into the US - doesn't sound like she has a visa to me. After a quick internet search, I found many other examples of similar experiences which all turn out to be a scam. Basically, Mary will try to pay the deposit in advance, but only be able to send me a cheque worth more than the deposit amount and expect me to send her back the difference. The cheque of course will be fake.

The question is now, what should I do next? A bit of scammer-baiting maybe?