Legal Question in Family Law in California

In the absence of a court order, either parent has the right to take their child anywhere. Since you have lived in California for over six months with the child, however, California courts have jurisdiction over her. I'm not sure what the Oregon jurisdictional time is, but it could be shorter. So you really need to get a custody action on file in California immediately, and then get an emergency temporary custody order, including an order that she return the child to California to school. You will then have to arrange to have that served on her in Oregon. If she does not return your daughter, then you can have the Oregon authorities take action against her.

This is a serious situation, not just personally as I'm sure you know, but legally. You need to act quickly and decisively. Even if you want to work out her mother having more of a role in her life, you have to move on this or it could get complicated by two states having conflicting rules and if the mother files in Oregon, two actions going at the same time.