Everything she said was flat and it sounded like she was trying too hard to speak outside her comfort zone.
This is true. Unlike the Japanese actresses, Sarah LaFleur doesn't have a naturally deep voice. I'm kind of confused why she got picked for the role. Honestly, I thought she did a good job for the most part (especially given the direction she had). I think her voice fits better than Erica, but her acting is a bit wooden. I really liked her performance in episode 93.
Also, I do like Junko, though I think her voice is too
deep. Ogata has a deep voice, while still retaining some femininity. Junko doesn't.