How can one deal with the talk of people and relatives after the husband's death, especially when committed to modesty and proper conduct?

You must be patient and seek reward from Allah, for Allah will create a way out and a relief, and He will replace it with something better for you. Do not mind people's talk as long as you are obedient to Allah and modest, for no one is safe from what people say. Allah acquitted Aisha when she was patient and held fast to Him, and similarly, every believer who is truthful with Allah and holds fast to Him will not be abandoned by Allah, for the ultimate outcome is for the righteous.