should i take my mom to the aquarium ?

I've been wanting to take my family to the local aquarium for months . I finally have enough money and arranged everything with my nephew and his fiance so we could all go together .

When I surprised my mother with the news , that we all were all going to the aquarium tomorrow she wasn't happy. she said that it would be too much money , that she has bills to pay , that my nephew would probably leave early because he wants to be with his fiance instead of us , that it would be cheaper if we just went without her , that i would starve if i took us because it would take all my money ( which isn't true )

I was very sad she said this . I was having a very good day , and she made me feel so stressed, disgusting and unhappy . Im not sure what to do , I want to take her still but I'm starting to think i should just go alone . It makes me feel very depressed and I feel ashamed of my mother because she does not want to make happy memories with her family .

after i told my nephew I wasn't sure what to do because she was acting up, he became upset because he thought the things she said were "harsh" and that she was "putting me down" for wanting to do something nice for the family . Overall I've been depressed, I feel very stressed and don't know what to do

could someone please help me ? any suggestions ?