That is correct, your wife and daughter can obtain the BB stamp in their passports.
Did you complete Report of Birth to the Philippines for your daughter? She would be a dual citizen, thus can have both U.S. and Philippine passport and would not need the BB stamp.
" There's a new Philippines travel update, with some good news! The latest IATF resolution removed several of the requirements for entry into the Philippines - no more RTPCR tests, no more travel insurance, and I have a warning about a new scam related to obtaining the OneHealth Pass! I'll post a link to the new resolution, along with the current list of requirements for entry. "
https://www.officialgazette.gov.ph/downloads/2022/05may/20220526-IATF-Resolution-168-RRD.pdf?fbclid=IwAR3IaRqju19ZyzSNJk8Z_W2kgd3rnMcNzrzbOpzTVzYtx4_-6DqD0rrrp0k
Yes she is a "former citizen" ... Carrying her old Philippine passport will provide evidence of this to obtain the BB stamp
Does your wife have her U.S. passport? (A silly question but asking)