Cat joy?

I really have a love/hate relationship with my cat. I fell over her twice today, not from her hiding in unsuspecting places and me not noticing , but more she walked directly under my feet. 

Now I know that my legs are a bit wobbly from the gym yesterday and my reactions aren’t as quick as usual but does she really have to test me in this way. 

Also for the last 30 mintues she has been outside the back door meowing, thinking that she wants let in. Every time I open the door she looks at me then walks away. Twice I thought she wanted to show me something but no. Just walks to the garden bench jumps up, lies down and meows some more. 

Is she protesting from me tripping on her.