Her computer has the latest version of QQ.
Her computer hardware driver was correctly reinstalled.
Check the running time of the notebook to see if there is a very high temperature. If yes, it is recommended to find an expert to turn on the dust removal or replace the fan and other equipment.
If you don't know much about computers, you may have downloaded and installed various softwares for a long time, resulting in insufficient system disk space, or insufficient program operation and storage. You can uninstall software that you don't use or don't use often.
Reinstall the system after backing up the data.