lupang matagal na nabili, kineclaim ng anak ng nagbenta

my mom bought a house and lot many years ago. and now, the seller's daughter have resurfaced and wants to claim the said house and lot. they have already faced in court and my mom won last year. but yesterday (7 months after the court ruling), she recieved a message from her attorney stating that the said daughter filed an appeal in the CA regarding the ruling..my question is, is there an expiration date as to how long the daughter can make an appeal? i have suspicions on my mother's attorney 'coz my mom didn't recieve yet a letter regarding the appeal. isn't it normal that she should've been the one who recieved notification instead of her lawyer?.. I would love to hear legal advice from you guys. thanks..