I feel they're not really spoiling her character - they are just keeping it flexible
She might claim to not be a Parvati in one, she might just be her in another, Works comes first at the cost of her wedding ... no no fil comes first with no real pressure in another, she might not trust Rohit, but might trust Sumit(probably long term husband trust? ) she might be a doormat in one epi, stand up for herself in another, she might lie in one epi, not take others lying in another, she might hide or seek, but would remind Rohit his promise in another, she might solve others problems in one epi, she might create new problems in another ... she might be trusted with a secret(in case of ajit), probably not with another secret(in case of Rohit). She might come across saccharine sweet in one episode, she might be perfect in another, she might not make any sense in one (her monologues and camera sympathies) but she might make sense in another.The only thing that's predictable about her is the saree and jhumka
She'll make you scratch your head, bang your forehead, in one episode, you'll love her in the next - she's unpredictable. One Ronakshi moment ... and Sona telling Rohit that she hid Ajit spilled it since Rohit anyway didn't trust that she didn't share the secret with Suman - will be enough for Rohit to apologise ... Every episode of this show needs to be looked at in solo .... don't think of it as a character sketch please