Regarding self-confidence and a desire in Avodah, she should contemplate that: 

1) Every one of the Jewish people is Hashem’s Shliach to illuminate this world etc.

2) Chinuch of the Jewish people now is an Inyan of Pikuach Nefesh Mamesh

For sure this will help for the above matter.

(Ksav Yad of the Rebbe)