1.It appears that you have married the girl in a family which is full of rogues.
2. i do not find any reason that even after satiating their demand the girl is likely to find peace and happiness.
3. If the husband is not supportive and affectionate to her then no kind of dowry can bring happiness to her.
4. Ask the boy to stay separately with girl and then you can think of fulfilling their demand.
5. if he does not agree then do not give any dowry and either settle the case amicably by mutual divorce or file criminal case of bridal torture and dowry harassment and case for her maintenance.