I don't think you are over reacting at all. Sometimes families get overwhelmed when loved ones goes missing its just an awful time for them. I am not sure how invested you are in finding her but I'd make notes of the little things that appear off and bother you. As far as a search goes I realize a lot of people is an ideal situation but whether it is 50 or 5 anything is better than nothing. Does the town you are from have a local Facebook group where they post local things like traffic, crime, dissatisfaction with a business? My town has a "Rants and Raves" page, if you have one of those post there with some factual information and see if you can get a response. If you need to and want to maybe you could see if it were ok with the family if on your friends behalf you jump on board and try to get some traction on this to see if it will drum up some information. Of course these are just suggestions but like I said family or friends have to be an advocate for the missing. You have to make noise to be heard.