Yes, "the other days of the week she works at her office as usual" is perfectly correct and natural, it implies an ongoing stable condition, not expect4ed to change.
It could be rewritten to use "working" for example
She is now working at home 2 days per week; she is working at her office on the other days of the week she works at as usual.
This emphasizes the current state of things, and does not convey as much of an impression of stability, but the difference is quite subtle, and the essential meaning is the same.
Personally I would prefer "two days a week" or more formally "two days every week" to "two days per week", this use of "per" doesn't seem quite natural to me, but it is certainly not wrong., this is really a matter of style.
As written, the sentence could be read to imply that she is working every day: two days at home and the other five at her office. I don't think that is what is intended, but the use of "other days of the week" somewhat implies that. This imp0lication could be avoided by saying "the other three days" or "the other work days" or some similar qualification; perhaps this is slightly pedantic.