More info has been made available by one of the German researchers and they may have found an obituary, You need to know that Rosa married a Dutch SS soldier on May the 8th the day Hitler killed himself, to obtain Dutch nationality. The marriage was one of convenience, and was an attempt to flee to safety. The researcher tells us the following, His English is better than my German!:

The known facts in brief :
On 8th of May 1945 Rosa must flee to the demarcation line near Pilsen and during this escape, she probably even had to witness her husband being murdered.

After that Rosa was registered in in Karlov 1.

According to the detailed researches from Wofi, Rosa moved from Prag(?) to Ingolstadt at 06.09.1945.

She have married a Friedrich Dürr on 08.11.1952 in Ingolstadt

And now just some assumptions:
Her marriage to Friedrich Dürr later ended in divorce and Rosa resumed her birth name.

She never remarried, or any later marriage did not last, so she kept her birth name.

Rosa had no means of saving personal documents and photos from her homeland during her escape, or even later, so her family members in Ingolstadt had no additional information about her (this sounds very probably for me because this was the same with my mother who must flee from Schlesien to Western Germany 1945)

Sometime later Rosa moved from Ingolstadt to Weilheim (the place name in the obituary)

When she finally died in October 2022 after a long life, her surviving relatives no longer had any reliable information about her date of birth and maybe even about her birth place because she had been unable to save any relevant documents when she fled in 1945.
Therefore, due to a lack of better information, the date of birth was given as shifted by one day, and (as already mentioned) it is possible that even the knowledge of her birthplace was lost over the years. And without knowledge of her birthplace, there was no indication of which registry office to contact for research.

Therefore, for me it is not entirely out of the question that the Rosa from the obituary is exactly "our" Rosa Müller, who was born on August 28, 1925 in Weißensulz.

But anyhow, if I get it well (name of researcher Wofi) has already contacted that family – without any feedback so far.