How can one deal with a wife's quick temper and her continuous disagreements with her husband due to her lack of feeling financially, emotionally, and sexually secure, as well as with her mother due to her interference and creation of problems, all while she feels guilty towards both of them?

Your mother remains your mother, the one whom Allah has commanded you to honor and forbidden you to mistreat. You must advise her gently. Similarly, your husband has a great right upon you, so discuss his mistakes with him and advise him to change them. Be patient with both of them and do not react with anger when speaking to them. If your anger is beyond your control, then you must seek treatment from specialists.