Is it permissible for a Muslim woman who maintains her prayers and remembrance of Allah to be confident of entering Paradise despite her numerous sins, given her fear of falling into hypocrisy (riya') and presuming upon Allah (al-mann ala Allah), and is concealing acts of worship out of fear of hypocrisy correct?

For a servant to perform good deeds while fearing they may not be accepted is a characteristic of the righteous. Having a good opinion of Allah is praiseworthy and motivates the servant to strive in good works, for Allah Almighty says: "I am as My servant thinks of Me." However, one must beware of self-admiration and admiration for one's acts of obedience, as it nullifies deeds and destroys the individual. Moreover, concealing good deeds is religiously مطلوب to increase sincerity.