Final answer:
Molly's mom paid approximately two hundred and fifty pounds for the white dress.
Step-by-step explanation:
The inquiry about Molly's mom's payment for the white dress reveals that the approximate cost was around two hundred and fifty pounds. The dress seems to be a noteworthy acquisition, possibly categorized as an 'emergency' expense by Mrs. Linde, suggesting that such purchases are considered special or unexpected. The specific mention of it being fortunate to have the money implies that this expenditure was not part of the routine budget, adding an element of significance to the purchase.