Depends on what you did to it. Wash the scrapes, ice the ankle to keep swelling down and if you can walk on it afterwards I'd think you're ok to roll. Don't keep walking on it if you instinctively want to baby it though.

In addition to my MG, I have a condition where the bones in my feet periodically scrape the sheath off the nerves that run between them up to the toes (it is quite painful to walk on as you can imagine). The fix for this is not worth the risks to me, so I suck it up and walk the best I can, take pain killers etc. The problem is walking like this is not a normal gait and it makes the walking muscles work harder so the MG certainly notices this. Walking with a sore ankle is similar, you're not walking with a normal gait so watch out for MG kicking in on the over-worked muscles on the other side of your body around the hip & hamstring.