hmm I have
Jarita who stll lives with her mother
Charulekha, She's a bit of a priss and hates getting dirty but her father also wears a mask so she might think your boy is a trustworthy type if she got lost.
If you really want to push your boy and the foals I also have
Bangil. Bangil does not live her mother but with her father and is a bit more adventuresome then Jarita, Bangil and Jarita are best friends and its likely they could have gotten lost together while under Charulekha's care since they are prone to wandering off on her.