I don't think Maricela's "secret" is relevant to her going missing. I don't think she was meeting anyone.
I do think this timeline is important. This bolded section is vital to sleuth and find out more about. These two were up to no good. Why in the world would someone randomly ask a pretty young girl if her phone was dead, in a dark parking lot, in the rain, with no one else around? Super sketchy.
I do believe Maricela left to smoke, and was approached by someone(s) as soon as she stepped out of the store. I think they saw the girls go in, and waited for their opportunity. Predators. I think she got away from them and went into the church. I think she saw them again, and went out to get away. They continued to follow her. I think in her panic, she took out her phone to make a call or text, and they nearly caught up to her... And she dropped her phone. She then started running, was a little lost in her panic, realized she was going the wrong way so doubled back towards Sherman. I think they continued to follow her, flushed her out, got her cornered, and finally caught her and pulled her back to the dumpsters. This is because of the zigzag pattern the dogs detected in the Kaiser lot.
I think the second person disabled and broke the phone, then also went and got a car and drove it into the kaiser parking lot to retrieve Maricela and the other person.
I think the cameras from all the stores, hospitals and banks must have footage. If the police down there aren't pulling an all out search by now, they should be sued and absolutely shamed. I hope Nancy Grace gets involved and does just that. We need to find Maricela before it's too late.... And before these people take more girls.