DP vs EP -spouse after maternity break ,which is reliable in SG?

This is a very good question, and in the end only you (and her) can decide. But here some pointers:

1. Despite the possibility of remote interviews by videoconference, finding a job from abroad (and especially India) is still much more difficult than when she is already in the country. Most applications without local address immediately land in the bin.
2. Many companies do not know the possibility of working on DP and/or are not willing to consider it.
3. Some reject the idea, because it makes the employee less dependable for on them - if you as husband and DP sponsor lose your job, they will immediately also lose your wife as employee!
4. For this reason (and because DP holders by definition do not depend on the income) she will probably also not get promotions, salary increases and career advances as long as she is on DP.

I thus recommend she comes to Singapore for a job search on DP, but switches to EP when she finds one.

Are you aware that people on DP are no longer authorized to work? Getting a WP used to be a loophole but not sure whether it's still an option

@nelyanne Thanks for your comment - you seem to be correct: The possibility to work on DP (plus a Letter of Consent, LoC) is not available any more on MoM's webpage (except for running your own business on DP):

https://www.mom.gov.sg/passes-and-permits