I would advise against raspberry leaf tea, and the woman currently drinking it should stop. As another poster said you shouldn't drink it until 36 weeks as it help induce labour. However, there is also no scientific research to this, but this is what most people believe.
It also depends from carer to carer. I know some doctors say don't drink herbal, and some say go for it.
But just cut back to decaf. You can have more cups of tea that way.