A dispute like this can not be ruled on without knowing more details about the situation and without hearing what both parties have to say about their side of the story.
Obligatory spending on financial maintenance of wives and children is to be moderate - judged so in accordance to the customs and the status of the husband and the wife.
لينفق ذو سعة من سعته ومن قدر عليه رزقه فلينفق مما آتاه الله لا يكلف الله نفسا إلا ما آتاها سيجعل الله بعد عسر يسرا
Let the man of wealth provide according to his means. As for the one with limited resources, let him provide according to whatever Allah has given him. Allah does not require of any soul beyond what He has given it. After hardship, Allah will bring about ease.
— Quran 65:7
وعلى المولود له رزقهن وكسوتهن بالمعروف لا تكلف نفس إلا وسعها
Upon the father is the mothers' provision and their clothing according to what is acceptable. No person is charged with more than his capacity.
— Quran 2:233
أسكنوهن من حيث سكنتم من وجدكم
Lodge them [in a section] of where you dwell out of your means
— Quran 65:6
خذي ما يكفيك وولدك بالمعروف
Take what is sufficient for you and your children, and the amount should be just and reasonable.
— Bukhari
أن تطعمها إذا طعمت وتكسوها إذا اكتسيت
Give her food when you eat, clothe her when you clothe yourself
— Abu Dawud
Luxury goods or gadgets which she does not need are not obligatory. Rather what is obligatory are essentials like food (2-3 meals a day of suitable quality), clothing (a complete set once or twice a year), accommodation (a private room with facilities like bedroom, kitchen and bathroom), items of everyday use and servants (depending on status and customs). And if there is a dispute then what the judge fixes as her maintenance.
Anything beyond the reasonable necessities is good but not obligatory. You should show favor to your wife and give her gifts but you do not have to indebt or inconvenience yourself or your mother for that.
Ref: https://islamqa.info/en/answers/103422/ and https://islamqa.info/en/answers/242838/