It is very unlikely that a viable lawsuit can be maintained against law enforcement. There are three problems:1) First, there is no liabilty unless there is a violation of a duty. It is doubtful that a court would find that law enforcement has an enforceable or mandatory duty to perform a "welfare" check based on the phone calls. While the police do welfare checks, it is not at all clear that they are required to do so every time there is a call. With no duty, there would be no liability.2) Even if there was a duty to perform the check, for a lawsuit to succeeed, it would have to be shown that under the circumstances (given when calls were made; the contents of the call and whether the mother seemed credible (believable) about her concerns) that the police had been "negligent," or unreasonable careless, in not performing the check within that time period.3) And in addition, causation would have to shown: that had the police made the check wnen the mother called, that the daughter would not have killed herself. If she had killed herself before the check, or reasoanbly could have passed the check then killed herself later, the check would have had no effect on the outcome; and if there was no effect, there would be no liability. It would likely be impossible to show that the suicide was the result of no check being done.