Child Support as verifiable income?

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Wondering if anyone has had an experience in rent being late because child support wasn't received.  I have a tenant whose circumstances have changed. I have nothing bad to say about her as a tenant, but I'm trying hard to see how she's going to afford the rent in the future unless she brings in a roommate with a much higher income. At this time, her prospective roommate's income is pretty low, but they have no debt that I am aware of. My tenant is currently negotiating child support payments she expects to receive. In our area it is not unusual for tenants to pay 40-50% of their income toward rent. She is pretty close to that threshold if she actually gets the child support, but falls short if she doesn't. 

So, at this time, obviously the child support cannot be considered verified income, but down the road, once she has a decision, it's hard for me to feel confident that she will always, without fail receive the child support payments, and hence, be able to pay rent on time.  I am all for working with good tenants, but this is making me uncomfortable. At this time I am leaning toward giving her 30 days notice with a good reference.  

Does anyone have input regarding the child support as income issue?