Meaning of "losing her grip"

[Jopan]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #11 "Losing It", question 7

After only a few weeks as a teacher of very badly behaved children she realized she was losing her grip.

(a) losing her point
(b) losing her purpose
(c) losing her control
(d) losing her feelings

English Idioms and Expressions, Advanced Level

ESL/EFL Test #11 "Losing It", answer 7

After only a few weeks as a teacher of very badly behaved children she realized she was losing her control.

Correct answer: (c) losing her control
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what's meaning of losing her grip?

Jopan

[Mister Micawber]

.
lose one's grip. Also. lose it.

1.

Fail to maintain control or one's ability to function, as in Ted wasn't running things the way he used to, and his boss thought he might be losing his grip, or I thought I was losing it when I couldn't remember the words to that old song. The first term dates from the mid-1800s, the slangy variant from the mid-1900s.
2.

Fail to keep one's composure, as in When Billy broke the window, Dad just lost his grip and let him have it, or I just can't deal with this many visitors I must be losing it. [Slang; first half of 1900s].

(courtesy of Dictionary.com)
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber