"Local factors must have been responsible for the party's performance in seats where it did not do well," she said while talking to reporters here.
She said the party's bypolls performance will be reviewed in the party forum.
Replying to a question, she said it is wrong to link the party's show in bypolls to Narendra Modi's popularity.
"The bypoll result doesn't reflect the national mood. It has nothing to do with Modi's popularity," she said.
"So there must have been local factors like ticket distribution at work where we have not done well," she said.