Help my mom will find out

I am so scared she will. Any advice would be good. Im on vacation with her and we have almost every meal together she noticed my behaviour multiple times and asked if Im dieting a few days ago since then she is constantly looking at my food asking why dont I eat why am I having so little.She is testing me she asked if I want waffles i said I dont like them which was stupid cause she knows I does then for milions of foods she brings me some chocolaty things I am out of explinations I told her Im not dieting and was like what diet but I cant tell her I am because she knows Im underweight she asks ab my weight all the time I lied and say a higher number but she was still concerned. She looks at my diet foods and I cant keep saying I like them better. I was able to just eat whats put in front of me to hide it but now my brain is simply not letting me. And no I can never let her know she will go insane. Are there any better explinations? Is there anything I can do I try to eat more when there is a safe food but its not helping anymore I am here for another few days and Im stressing out I have to somehow convince her Im fine