"Feeling dizzy and weak during pregnancy is normal. But it is not normal to have a very low heart rate or highly fluctuations. And that's what happens in Avery's case and at the same time, her blood pressure is low.
I am saying once again Low blood pressure is also normal but not in her case. If she is dizzy, it could also be due to low blood pressure. I am telling you this because her heart rate is very low which may create problems in future. You have to take care of all these things. Make sure she sleeps on her left side, which improves blood circulation. Another thing is if she is sitting or on the bed, do not let her stand up straight directly as this may cause her to suddenly feel dizzy.
Sudden dizziness can also cause her to lose her balance which can cause her to fall down hard which can injure her badly.