My sister has had a flight cancellation/change notice and am seeking advice please.

In October she is flying LHR to SYD via KUL, originally MH1 and MH123. MH123 has now been cancelled and she has been changed to MH141 which means an overnight 16 hour layover. Obviously this is far from ideal so what are her options, would MH allow her to perhaps change MH1 or to a different day? We've not dealt with MH before so not sure on their flexibility so she wants to make sure she knows what she should expect when she calls them.

If they don't allow changes and she's stuck with this would they provide a hotel for the overnight? She's travelling in business if that makes any difference, no status.

Thanks in advance!