This is an idiom. The phrase "remain in force" means that her vows will remain in effect and she will be required to fulfill them. See how you translated a similar phrase in [Numbers 30:4](../30/04.md). Alternate translation: "then she must fulfill all her vows ... she must fulfill" (See: [[rc://en/ta/man/translate/figs-idiom]])
These two statements say basically the same thing twice for emphasis and can be combined. Alternate translation: "then all of her vows and promises with which she has made must remain in force" (See: [[rc://en/ta/man/translate/figs-parallelism]])