Yusuf,
Read the rule again:
Indefinite leave to remain as a highly skilled migrant
135G. Indefinite leave to remain may be granted, on application, to a person currently with leave as a highly skilled migrant, provided that he:
(i) has had a continuous period of at least 4 years' leave to enter or remain in the United Kingdom in this capacity or
has had a continuous period of at least 4 years' leave to enter or remain in the United Kingdom which includes periods of leave to enter or remain granted under paragraphs 128 - 319 of these Rules; and
(ii) for the period of leave as a highly skilled migrant, has met the requirements of paragraph 135A (i)-(iii); and
(iii) for any period of leave not in this capacity, has not had recourse to public funds; and
(iv) is lawfully economically active in the United Kingdom in employment, self-employment or a combination of both.
Point (i) states:
"or has had a continuous period of at least 4 years' leave to enter or remain in the United Kingdom which includes periods of leave to enter or remain granted under
paragraphs 128 - 319 of these Rules;"
Spouse of a WP holder falls under Paragraph 194 , therefore your wife is eligible.
SPOUSES OF PERSONS WITH LIMITED LEAVE TO ENTER OR REMAIN UNDER PARAGRAPHS 128-193 (BUT NOT PARAGRAPHS 135I-135K)
Requirements for leave to enter or remain as the spouse of a person with limited leave to enter or remain in the United Kingdom under paragraphs 128-193 (but not paragraphs 135I-135K)
194. The requirements to be met by a person seeking leave to enter or remain in the United Kingdom as the spouse of a person with limited leave to enter or remain in the United Kingdom under paragraphs 128-193 (but not paragraphs 135I-135K) are that:
link:
http://www.ind.homeoffice.gov.uk/ind/en ... ion_3.html?