Dingboche is generally a safe place for solo female travelers. The locals are friendly and respectful, particularly towards foreign women. Crime rates are relatively low and incidences of crime against tourists are rare. The main safety concerns are related to trekking at high altitudes such as acute mountain sickness, but with proper acclimatization and preparations, these risks can be managed. However, it's always wise to be cautious and respectful of local customs. Always inform someone of your trekking plans and don't trek alone, if possible. Lastly, hiring a reputable guide may add an extra layer of security.