UK visitor visa - too many long stays?

Hi everyone, my mum has a UK Standard Visitor visa (Nov 2024 to Nov 2026, multiple entry).
Her stays:
Jan–May 2025 (~122 days)
Nov 2025–Apr 2026 (~152 days)
Planning next visit:
27 June 2026 to Oct/Nov 2026 (~120–150 days)
Total would be ~400 days over 2 years.
Is this likely to cause issues for future visas or entry, even though she always returns home in between visits?
Thanks for advice :)