Hi, Mick. Mother's Day poems should be squishy and wooogy. (Wooogy?) I know my Mom soaks up mush like one of those super-absorbent paper towels they advertise on TV. Just think of it not so much as a "poem" as an expression of love.
Having said that, my usual response would be to tell you to just use your own words, which are much more powerful and meaningful than any tweakingliness anyone else would give to your poem. Unless your Mum is an English professor, she's going to care much more about what you say than how it's said. And if she's like my Mom, the mushier, the better.
Well, OK, but my comments are simply comments. Use them if they help, lose them if they don't. You yourself know better than anyone whether this poem will please your Mom.
Your meter isn't consistent, but I don't think that matters at all. It doesn't make the poem sound odd, so I would leave that alone. I get a little confused in the end lines, though. I assume "the young angel" is a sibling?
That's the one thing I might change a bit, but I would also guess that your Mom would know who you're talking about and wouldn't be confused by it, in which case I would leave the whole thing alone.
I'll bet a box of chocolates she'll love the poem.
Hmmm... Maybe I missed the mark somewhat. Its actually for my wife. The "angel" would be our daughter.