Need to tighten this one up. Suggestions?

I've had to think long and hard on that question, and re-read this quite a number of times.  It seems to be pointedly ambiguous at the end - sell her pearls?  sacrifice her pearls of wisdom (somehow)?  I don't know.  The actual image I get from the final stanza is yourself driving away from the stoplight, making mental connections between what you saw and what you remember of your mother, or of the errand you're on.  Perhaps its all of this, or something more elusive.  What I like about the poem, besides the strong imagery, is all the word play with christian symbols.  The poem seems very ripe, yet still elusive.  Whatever changes you made, I can't say I know for sure what they were.  Still, I like the poem quite a bit.  And it still disconnects me some, though I have no suggestions.  Which is somehow fitting.