die Helferin
female helper
A female person who provides help to someone or assists with an activity.
Beim Aufbau des Festzeltes war jede Helferin willkommen.
Every helper was welcome when setting up the festival tent.

helper
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female helper
A female person who provides help to someone or assists with an activity.
Beim Aufbau des Festzeltes war jede Helferin willkommen.
Every helper was welcome when setting up the festival tent.

The word is the feminine form of 'der Helfer' (the helper). It derives from the verb 'helfen' (to help) and takes the typical feminine ending '-in'.
Ohne die vielen freiwilligen Helferinnen wäre das Fest nicht möglich gewesen.
Without the many volunteer helpers, the festival would not have been possible.
To describe the activity with which help is being given, you use the preposition 'bei' followed by a noun in the dative.
Sie war eine große Helferin bei der Vorbereitung der Konferenz.
She was a great helper in preparing the conference.
'Helferin' (female helper) is often used as the second part of compound words for jobs or functions, for example 'Arzthelferin' (medical assistant), 'Küchenhelferin' (kitchen assistant), or 'Wahlhelferin' (election worker).
Die Arzthelferin hat mir Blut abgenommen.
The medical assistant took my blood.
helper
'der Helfer' and 'die Helferin' both mean a person who helps or supports someone. The difference is mainly grammatical and natural gender. 'Der Helfer' is used for a male person, or sometimes generally when gender is not important. 'Die Helferin' is used for a female person. The words can be confused because the activity is the same. So pay attention to the person you are talking about. For a woman, 'Helferin' sounds more precise and natural; for a man, 'Helfer' does.

Lisa ist morgen beim Training als Helferin dabei.
Lisa will be there tomorrow as a helper at training.
Bei der Veranstaltung erklärt ein Helfer den Gästen den Weg.
At the event, a helper shows the guests the way.