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Boulter is also very settled in her personal life and was out on Court 18 on Friday watching long-term boyfriend Alex De Minaur in his second-round loss to Matteo Berrettini.
Boulter has spoken about how much she has learned from the Australian's grounded nature, and Keothavong believes they are a good influence on each other.
"Alex is so down to earth and so lovely," said the former British number one. "They are sickly in a very cute kind of way.
"You can tell how much they care for each other and how much they support each other and it was great to see him court-side supporting her after his match and you see it within their families as well.
"It's hard enough being a tennis player, the emotional highs and lows. You need people around you who are going to stay level-headed and not look too far ahead or get too excited but help you keep your feet on the ground."