trying to sleep train my baby! help?

Bunny • ttc 4 years with 2miscarriages. Rainbow BABY GIRL born 3/10/18💕🌈 Gorgeous girl#2 born 02/19/19💕💕 baby #3 due 03/01/21

my daughter is over 24 weeks old & she has had a sleep routine since 5 weeks old & it has been very effective till recently. for a few weeks now she screams & fights naps during the day no matter what i try & recently has had trouble falling asleep for bed. other than that she wakes up once at 4 am for 15 mins then sleeps more. but im looking for books to read for sleep training or something that has helped mammas out there? i really dont like crying methods