Some Christians believe that speaking in tongues is okay, some don't. I'm not going to argue either way here, but I'll encourage you to search out the matter for yourself, starting with Acts 2 and 1 Corinthians 12, 13 and 14.
The requirement to have a prayer language does not have broad scriptural support, so the concern would be in how hard they emphasize it.
I'm not trying to pry, but I'm wondering what your concern is. Does your husband still have some connection with this gal, or are you just curious about the practices of the church without reference to her?