If a woman did not go to Mikveh on the night after the 7th, must she continue doing daily Bedikos until she immerses?

No. This law only applies by a Kallah which immerses prior to her wedding as explained next.

A Kallah:[1] A Kallah that immerses prior to her wedding must continue doing two daily Bedikos after her Shiva Nekiyim until she has marital relations with her Chasan after the wedding.[2] These two daily Bedikos are required during all days in-between her seven clean days and marital relations after the wedding, and hence must be performed daily in the days between her Shiva Nekiyim and immersion [if the event that there are days in-between], and in the days between her immersion and the wedding. Thus if she completed her Shiva Nekiyiom on Sunday, went to Mikveh on Tuesday night, and is getting married Thursday night, she must continue doing two daily Bedikos until Thursday night. Furthermore, even after the wedding, if for whatever reason she did not have marital relations that first night, she must continue to do 2 Bedikos each day until she has successful intercourse.[3] Nevertheless some Poskim[4] are lenient in this matter once the Chupa has taken place, and hence those which are lenient to forgo these Bedikas once she has become married have upon whom to rely.[5] In the event that the Kallah did not do any of these Bedikos past her seventh day, she nevertheless remains pure.[6]  If however seven days have passed without Bedikos prior to her Chupa [irrelevant of when she went to Mikveh], she must recount the seven days.[7]