OP, I reckon @FictionalCharacter has it.
She probably clocked your expression and knows bloody well that she has over stepped and is in damage control mode.
Also @MzHz has nailed it too.
If you don't feel like saying anything like "hardly🙄, you never stopped criticising the poor little thing", then simply say nothing.
But as @MzHz suggests YOU should "say it like it is" and your husband can see her alone.
I must say I wouldn't be one bit impressed with your husband being so happy to ignore his child being bullied by his friend, and then too scared to remark on it at all.
Scared, frightened of their own shadow men, are so unattractive and IMO not to be relied upon.
They never have ANYONES back other than their own.
Children so need parents to have their back and protect them.
How dare she presume to criticise your child....for a whole weekend!
You keep doubting yourself when you shouldn't.
That woman's behaviour was appallingly rude to you and your little girl, yet your husband is happy to ignore it and carry on.
Respect is so IMO in a relationship and I would be losing it very fast for him.
His priorities are very strange.
Choosing a women friend over his own child?
So unattractive.