To my ear "go in front of" is a bit unnatural or awkward, but not incorrect. I would use before instead of in front of:
I'll never be able to come before her again.
I'll never be able to go before her again.
The phrase in front of her suggests plainly the physical location whereas before her suggests being with her, in her presence for some purpose. Also before is just fewer syllables to say. =P
That being said, the phrasing you already mentioned in your question is great too:
I'll never be able to face her again.
Using this phrasing also suggests more than just plain physical location, even some emotional or psychological aspects of interacting with the mother. If anybody thinks of other good verb phrases, please comment. :)