It is possible:
- She faces a situation where she realises the value of her mangalsutra and therefore decides to come back
- She conveniently uses the mangalsutra to say she is still married to Dev in case she meets Purohit family
- She will use it if she has to emotionally blackmail either family if she makes her entry during RaDev wedding.
Her mangalsutra is an eyesore as of now, I don't know what the creatives are planning....