Whatsapp can't be downloaded / updated. What can this be?

Ut
- in P series
7

I have the following problem: My girlfriend still uses a previously reliable Huawei P6. Yesterday Whatsapp told her that she needed to update her version because she would not be able to use the app anymore. When trying to update them on the Play Store, however, nothing did. Also no error message or other. Since today she can no longer use the app. So we uninstalled the app and wanted to reinstall it afterwards. This does not work either - also without an error message. It just does not happen.
After a short search, I found that there was a similar problem probably already in 2014 by Whatsapp.
Can one of you help me solve the problem?

Sh

Does she have enough memory?

Ut

Yes, that's what we thought about first. Have then created plenty of space. Unfortunately that did not help.

Sh

Throw down Whatsapp and recharge

Think of a backup!

Ut

As I said, reinstalling does not work either.

Sh

Hmm, schonmal the phone rebooted?

Ut

Naturally.

Sh

Then, for once, I'm over-questioned. A hard reset times considered?