Hello
I hope I can help you
1- she can be in three places, New Arc City, Transylvania and in the abandoned city park just before where you release Rinny's tail.
2- there are three locations where you can find her In the devil's drink, the stripper club and the entrance to the slums.
3- Look at the university
I hope I have been helpful
Edit:
There is a cowgirl and a hidden bull that you can find in the park of the abandoned city once you do the renovations to the farm.
To find the cowgirl you need a fishing rod and fish in the lake of the park, because according to the words of the cowgirl she is a sea cowgirl.
And the bull is a prisoner of the fairies, to free it you need a golden apple.