Rather than insist that everyone has to earn less for your sake, you adjust your budget accordingly. 

How much income to I need to earn in order to qualify for this kind of money?

You might not meet the LTV the bank requires, but it may help reduce capitol necessary (house is worth 20k more than you purchased, would only need ~5k added to principal to hit required LTV).- To sell or to keep?  

I earned my salesperson license to help my investing.

As usual, don't expect to earn a lot when you start out - prove your worth.What are you doing right now with regards to learning real estate?

This does not factor in monthly servicing fees (which would reduce your effective P&I payment), or one-time fees related to for the purchase itself, loan boarding , etc. 

She'd love to have monthly payments vs a lump sum then loose 25% to cap gain taxes since her cost bases is near zero.This is the pitch:  offer to give her asking (if its really worth that much) but she'll get much much more from earning income on the interest on the balance.  

Earned about $100 per month.  

I have driven to property to discover that the maintenance appears to be deferred, even though there is a "manager/maintenance" person there with reduced rents.

You either have lots of money to pay for mistakes and learn from, or you learn beforehand and reduce costs to save money.Obviously there's a lot more to starting than just that, but you'll have more questions as you come closer to looking for deals, start the buying process, and so on.