She sounds completely normal for her age. Dd1 could speak in full sentences by 15 months whereas dd2 knows maybe 10 words. They're both normal just different ends of normal with very different strengths. If you are truly worried perhaps have a chat to your Mchn or gp. I feel for you it is hard to deal with challenging behaviour while pregnant I'm struggling with a toddler and a tween who both love to have tantrums.