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Because this ね is used as expectation for the agreement and reply like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the agreement and reply.

彼女とパーティに行けるといい means it is good that you can go to the party with her and this sentence added ね is natural because speaker expects the agreement and reply.

Because this ね is used as expectation for the agreement and reply like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the agreement and reply.

彼女とパーティに行けるといい means I hope you can go to the party with her and this sentence added ね is natural because speaker expects the agreement and reply.

Because this ね is used as expectation for the agreement and replay like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the agreement and replay.

彼女とパーティに行けるといい means it is good that you can go to the party with her and this sentence added ね is natural because speaker expects the agreement and replay.

Because this ね is used as expectation for the agreement and reply like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the agreement and reply.

彼女とパーティに行けるといい means it is good that you can go to the party with her and this sentence added ね is natural because speaker expects the agreement and reply.

Because this ね is used as expectation for agreement and replay like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the reply

彼女とパーティに行けるといい means it is good that you can go to the party with her and this sentence added ね is natural because speaker expects the reply.

Because this ね is used as expectation for the agreement and replay like そろそろ出かけようね.

彼女とパーティに行けばいい means you should go to the party with her and this sentence is a suggestion, so this sentence added ね is unnatural because speaker doesn't expect the agreement and replay.

彼女とパーティに行けるといい means it is good that you can go to the party with her and this sentence added ね is natural because speaker expects the agreement and replay.