Can my British friend do a border run in Thailand for an extended stay after her 60 days visa-free entry?

The user inquires about their British friend's ability to stay in Thailand beyond the initial 90 days, which comprises a 60-day visa-free entry followed by a 30-day extension, and if border runs are a viable option. Community comments suggest that she can perform a border bounce (exiting and re-entering the country) for another 60-day visa-free stay plus an extension. Recommendations for using visa-run agencies for convenience and to avoid complications at immigration are prevalent. However, there are warnings about potential scrutiny upon returning via air travel after border runs.