Ṭalḥah — feminine tāʾ plus proper-name status: diptote.
Zaynab — semantic femininity plus proper-name status: diptote; the special Hind exception must be checked separately.
Ḥublā and ḥamrāʾ — two feminine-alif patterns that are diptotes independently of proper-name status.
Always identify the relevant causes and their conditions before deciding how a word declines.