Hello shruti
yes bali is safe . stay in hostels dn hotels and u will mke frds. keep all the emergency numbers with you , in case u need them and make proper itinerary before u go
Bali is both safe and beautiful
In general South East Asia is quite safe and recommended for solo female travellers . I went to Cambodia last december on a solo trip and it was superb !
Yes its safe but Bali will be crawling with couples all the time. You might wanna checkout Thailand as many bachelors(guys/gals) or solo travelers visit it every year.