A:
She should perform sincere Tawbah of this bad deed and not do it again, as helping a corrupt person in their corruption makes one earn a sin.
Consulting imposters and charlatans is prohibited, and Allah (Exalted be He) says,
...but do not help one another in sin and transgression.
Accompanying her Muslim sister to imposters and charlatans does not render her a Mushrik, unless she believes in what they say. In this case, she falls under the category mentioned in the Hadith narrated by
Abu Hurayrah (may Allah be pleased with him), that the Prophet (peace be upon him) said,
If anyone resorts to a diviner or a soothsayer and believes in what he says, they have disbelieved in what was revealed to Muhammad (peace be upon him).
(Related by Imam
Ahmad in his Musnad (Hadith compilation),
Abu Dawud,
Al-Tirmidhy,
Ibn Majah,
Al-Bayhaqy and
Al-Hakim, who ranked it as Sahih (authentic) according to the conditions put by Al-Bukhari and Muslim.
It was also narrated by
Abu Musa that the Messenger of Allah (peace be upon him) said,
Three (sorts of people) will not enter Jannah (Paradise): the one addicted to Khamr (intoxicant), the believer in magic and the severer of the ties of kinship.
(Part No. 26; Page No. 328)
(Related by Imam
Ahmad in his Musnad,
Ibn Hibban,
Al-Tabarany
and Al-Hakim who ranked it as Sahih. It was also acknowledged by
Al-Dhahaby).
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.