Peremptory challenge in CA probate guardianship

My child is the subject of a probate guardianship. I am challenging jurisdiction and have filed a motion to vacate but I accidentally filed an “amended” notice of motion instead of a supplemental and the hearing was reset for three more months out. The judge granted a temporary order ex parte without following the statutory requirements and no parent received any method of notice let alone by personal service. Can I file a peremptory challenge if the temporary order has already been granted and the general petition is pending?

Location: Sacramento, CA.