Church mouse

I know of a church mouse
Pauline is her name
Cheese is not her main concern
But juggling numbers is

You never know where she is
Hiding behind many spreadsheets
But follow the very tiny footprints
And you’ll find her

Her very sweet and quiet nature
Makes it a delight
To be in her fragrant presence
An exceptionally true friend

On this your very special day
Marking a special milestone
The best is yet to come
A prophecy for you

Your best days, your blessed days
Your brightest days are ahead