Well, as a sub, when i push for more punishment it usually means i want attention. An online relationship can be very dificult because there are certain needs that just aren't satisfied so it's possible she feels like she needs more to fill the gap. Remember since she is an online sub it's possible something could be up with her computer or real life stuff came up that made it dificult for her to find time to log on. Next time You talk to her try to find out what it is she wants out of the relationship and see if it matches what You really want in a sub. Maybe it's just time to move on.