It really depends on whether you actually have enough money to pay the rent or not.
If you do... why would the landlord care how you get the money? Whether you do IM, or have a "real" job, even if you were selling crack on the street corner, or get a welfare check, what difference does it make? Money is money.
In this case, just photoshop some PayPal statements, printouts of affiliate accounts, etc. If she bitches about how this is not a "real" job, well there are many people working from home, whether its affiliates, content creation, web design, etc, why would this not be considered "real" to her?
If you dont, however, well theres a few options.
The "freelancing" (article writing, website creation, programming, etc etc) has been already presented in the previous replies, you can try that.
And while maybe this is not what you want to hear, but if there is absolutelty zero jobs in your town, have you considered moving to a somewhat bigger city?
I dont know how the situation is regarding jobs in the USA... but cmon, its not North Korea...
I know that where I live (Canada), there are many, many opportunities at "entry level" jobs, whether its retail, customer service, telemarketing (both the legit ones and the shady boiler-room type operations), security guard, etc and I know many people who didnt even finish high school making $15 or more an hour.
If you cant, or dont want to get a "regular" job, for whatever reasons... well I dont want to sound like I am being a douchebag, but its not a good idea to rely "making a living" online, unless you REALLY got your shit together already, and have demonstrated that you can make STABLE revenue, from different sources.
While the ideas shown here and in the other threads can help you out, and make some extra money, making enough to earn a decent living is not that easy.
By using some methods found in the forum here and elsewhere, making $100 + a day is possible... to me, I've done it. The challenge is making that amount every day, month after month, and its something me, and probably many other here, are still working on.
This is why I still keep my job, why I try to build some income online.