
Yes when some bitches stop bleeding is actually a sign that they are ready and willing to be mated, though some continue to bleed to the end, in most the discharge goes clear or clearer.
When the genitals have lost their swollen puffy look, and look closed, as long as it is at least 3 1/2 weeks since the start then she is likely to be finished, but best to assume 4 weeks from first sign of blood.
If it is her very first season, her Vulva will never be quite as small as before.