However, SA found some fight in their second essay through Luus (109, 203b, 18x4) and skipper Laura Wolvaardt (93 batting, 252b, 12x4).
Rana's figures were the second-best in a Women's Test innings for India after record-holder Neetu David's eight for 53 against England in Jamshedpur in 1995.
Overall, Rana holds the third-best Test innings figures, with Australia's Ashleigh Gardner (eight for 66) preceding her.
In the post-tea session, when their partnership surpassed 138, it also became the highest stand for the tourists against India in Test cricket.
Eventually, Indian captain Harmanpreet Kaur broke the 190-run alliance, getting rid of Luus when the score was 206 for two.
Top-order batter Sune Luus struck a fine century as South Africa fought their way to 232 for two in the second innings after India enforced follow-on, courtesy spinner Sneh Rana's exemplary eight-wicket burst in the visitors' first innings on Day 3 of the one-off women's Test here on Sunday. Chennai: India Women's Sneh Rana celebrates the wicket of South Africa's Masabata Klaas on the third day of a one-off test cricket match between India Women and South Africa Women(PTI)
South Africa still trail India by 105 runs, after they were bundled out for 266 in the first innings chasing India's 603 for six. Off-spinner Sneh Rana's deadly effort of eight for 77 hastened their collapse.
However, SA found some fight in their second essay through Luus (109, 203b, 18x4) and skipper Laura Wolvaardt (93 batting, 252b, 12x4).
Resuming at the overnight score of 236 for four, Marizanne Kapp (74) and Nadine de Klerk (39) could not sustain the momentum as the former soon fell to Rana.
Kapp's wicket opened the floodgates as the Proteas were bowled out in the subsequent 17 runs. Rana and Deepti Sharma got the job done with ease.
Rana's figures were the second-best in a Women's Test innings for India after record-holder Neetu David's eight for 53 against England in Jamshedpur in 1995.
Overall, Rana holds the third-best Test innings figures, with Australia's Ashleigh Gardner (eight for 66) preceding her.
Trailing by 337 runs, the Indians enforced follow-on as the South Africans suffered an early setback. Anneke Bosch was trapped leg-before for nine by Deepti with just 16 runs on the board.
The end seemed near for the South Africans then.
However, Wolvaardt and Luus joined forces to push the hosts on the backfoot.
The visitors were 29 for one at the lunch break and they batted till the tea break without further damage to take SA to 124 for one.
In the post-tea session, when their partnership surpassed 138, it also became the highest stand for the tourists against India in Test cricket.
Meanwhile, Luus brought up her maiden Test century, as she became only the second South African to hit a Test ton against India after Mignon du Preez (102) in Mysore in 2014.
Eventually, Indian captain Harmanpreet Kaur broke the 190-run alliance, getting rid of Luus when the score was 206 for two.
The dismissal brought Kapp together with the skipper and they batted out the remainder of the day. India took the new ball just three overs before stumps but did not do any wonders.
