What is your advice to a nineteen-year-old girl who loves religiosity and strives in its path, but sometimes considers becoming a martyr, then finds herself inclined towards worldly matters?

Loving Allah, His Messenger, and the believers is a sign of complete faith. So, whoever finds that within themselves should praise Allah and ask Him for more. For the human soul is by nature prone to fluctuation, and a slackening in supererogatory acts and love of this world is natural, and even the Companions complained of it. The advice is to maintain the obligatory duties, avoid prohibitions, and persist in supererogatory acts even if they are few, because the most beloved deed to Allah is that which is continuous, even if small.