Regarding your 1st question.
Scientifically …biologically , females have growth of height till teenage and males till around 20 or early 20s.
This may happen in rare cases upto age of 22/23.
Switch words work only on subconcious mind. There is no role of subconcious mind for increasing height after above mentioned age groups.
Some children may not attain normal height due to trapped emotions like fear or some other unwanted emotions which they would otherwise attain during their teenage. Here switch words may help.
In the case you mentioned the female is 28 yrs …so for height increase we do NOT suggest any switch words. Because it will not help.
If your relative knows a doctor who can treat height growth till 45 yrs of age….she can follow treatment from that doctor if she feels the need to increase her height.