Around 3-3 1/2 months my LO was sleeping great. Around 10/12 at night to 6/8 in the morning. Now at…

Around 3-3 1/2 months my LO was sleeping great. Around 10/12 at night to 6/8 in the morning. Now at 4 1/2 months she is staying up to 7/8 in the morning and wanting to sleep all day! How can I break her of this cycle? I try to wake her up earlier each day but she then stays up even later! I don't know how that's even possible! Lol