Because she is **Cantankerous.
Here is what it means from dictionary.com:
**can⋅tan⋅ker⋅ous
/kænˈtæŋ
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kər
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əs/ Show Spelled Pronunciation http://cache.lexico.com/g/d/dictionary_questionbutton_default.gif [kan-tang-ker-uh
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s] Show IPA Pronunciation http://cache.lexico.com/g/d/dictionary_questionbutton_default.gif
–adjective disagreeable to deal with; contentious; peevish: a cantankerous, argumentative man.
**Origin: **
1765–75; perh. var. of earlier *contenkerous, reflecting contentious, rancorous
:lol: