Where to find black mara? (The Witcher 3: Wild Hunt)

The wiki says that she is somewhere east of the shelter sign on crooked-ear swamps, and after completing the baron's quest chain, you can find her and ride her, but I ran around a lot, but there is no nichrome there, and at the fork in the road where we teach there is no black horse either, can someone give a screen with the exact location, although such people probably do not exist, who would be steamed and find it in the middle of the swamps. If you follow her when released, then she gets stuck in the bridge, and then disappears and cannot be tamed at this moment.