My daughter told me that she loves her friend more than God, is it natural for 12 years old girl to say so?

You should talk gently with your daughter about Allah and let her know the following:
• Allah is the One who granted her those friends she loves;
• He is the One who instilled this love in her heart;
• He is the source of love;
• He loves His servants who love each other;
• He is the Creator of this world and He based it on love;
• He made love the power that drives everything in the universe;
• And He is the Creator of blessings and bounties bestowed upon us.
You should ask her about the reason why she loves her friends to that extent and make it clear for her that Allah is the One who made the emotions exist in her heart.
Do not worry about your daughter; she is still immature and needs gentle reminders to realize the blessings of Allah.