Under the federal rules of civil procedure, if she does not serve her answer within the 30 day period, she can be subject to sanctions. She can simply object to some of the questions on any one of a number of grounds (and then answer them subject to the objection). If she simply objects to a question, Judicial Watch can then move to compel her to answer the interrogatory.
Aside from moving for sanctions should she not respond at all, that motion to compel would be the only immediate further action that Judicial Watch could take. Clinton would have 17 days (14 under the local rules plus 3 under the federal rules) to file an opposing memorandum. Assuming JW files a motion to compel immediately after the interrogatory answers are filed, that memorandum in opposition would not be due until October 17th. JW would then have 10 days (7 under local rules plus 3 under the federal rules) to submit a reply. Assuming JW instead immediately replies the day after Clinton's opposition, the matter would be in the district court's hands a full three weeks before election day. But the court won't rule immediately, and even if it rules in JW's favor, it could well set a date after election day for the answers.
King of Florida , check your freepmail please..