This would all depend on what I was trying to do and why she was crying. I actually get a bit turned on by tears, and if the sub knows this in advance, and I am striving for this response, I will push harder and enjoy it, then deal with it in aftercare.
On the other hand, if this is an unexpected thing and is not something I am working for, I will usually stop and check on the reason for the tears, and then proceed form there. this is not a clear response because the question actually evokes an mutifaceted answer that comes down to, it depends.