Sorry for your loss...
On your sisters Betta...make a new thread with the needed information and a pic in the disease/emergency section...It might be tail/fin biting...
Sorry, but I do NOT call members or give out my phone number-and you should not post your number on any forum for safety reason, however, I will be happy to help you in any way....Post in the disease/emergency section-be sure and complete the information in the sticky at the top of the section and add to your thread as well as a pic-Then send me a message and I will take a look....