How large is your phone screen? 
surely it canāt be read unless she stands right over your shoulder everytime open your phone?
Even thenā¦ it just so happens that you open the Monzo app, wait for ages looking at your feed until her eyes adjust to read the the line of text that says you bought flowers?
My partner never looks at my phone and couldnāt care less what Iām doing on it. Iām the same with her too so Iām just curious why thatās all 
I canāt even see it accidentally happening with reflections on the screen and everything else.
I guess you could make sure you only check Monzo when youāre sat at least 2 meters apart? 
At least until you do some more transactions to bump it down the list.