Complex sentence: Just like Sasana, she likes Mayu a lot, tracing back to when they were kids and Meiko had no friends and Mayu invited her to play with her and Sasana, but she refused.
Split into simpler sentences: Just like Sasana, she likes Mayu a lot, and the reason is due to their past. When Meiko had no friends Mayu invited her to play with her and Sasana, but she refused.