Complex sentence: Due to Ayumu always coming to talk to her, she seems to have developed a slight liking to him, even calling him a good drinking buddy in the anime and saying she will be waiting for him to join her for a drink.
Split into simpler sentences: Due to Ayumu always coming to talk to her she seems to have developed a slight liking to him. Even calling him a good drinking buddy in the anime and saying she will be waiting for him to join her for a drink.