Theory:

The computer swallowed grandma.
Yes, honestly it's true!
She pressed ‘control’ and ‘enter’
And disappeared from view.
 
It devoured her completely,
The thought just makes me squirm.
She must have caught a virus
Or been eaten by a worm.
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Explanation:
 
This poem has been written keeping older people in mind. Here, the poem was written by an anonymous writer. The poet was talking to his grandmother may be via skype or hangout etc. wherein he could see her and talk to her. She did not know how to operate a computer. She learned to use it off late after the whole world became digitalized slowly. She pressed ‘control’ and ‘enter’, and the poet could not see her on the computer anymore. It destroyed her or did not show her up ultimately. The thought made me feel like he was shaking from inside. Pun intended: he is saying maybe she was caught by some virus (it can be both computer virus or virus which every human can get caught with like flu), or perhaps she is eaten by some worm.
 
Meanings of difficult words:
 
NumbersWordMeanings
1.
Devoured Destroy completely.
2.
SquirmA wriggling movement.
3.
VirusMalware, or infectious agents.
Reference:
State Council of Educational Research and Training (2019). Term-1 English Standard-7. The computer swallowed grandma - Anonymous (pp. 16-17). Published by the Tamil Nadu Textbook and Educational Services Corporation.