I'm sure Mrs Bennet sees all Meryton mothers as eager to land husbands as she is !
Yet, typical of Georgian mothers, she does have 5 daughters to find husbands for.

My impression is if Mrs Bennet wants to eliminate the matrimonial competetion; she's going about it the wrong way.
Such remarks may draw attention to Charlotte as sociable- she dances and may often dine out.
Yet Charlotte is practical, being useful in the kitchen for supervising or cooking pies.
Charlotte does not possess Jane or Elizabeth's beauty yet Mrs Bennet is contidictory on Charlotte's looks.
I think Mrs Bennet's remarks indicate her underlying concern Charlotte is a competion for her girls-- She tells Mr Bennet she was so vexed to see Mr Bingley stand up with Miss Lucas.