She has a much better record indoors than outdoors (she won something like 22 indoor matches in a row in 2011-2013). She's literally the indoor GOAT, she has more indoor titles than Serena + Venus put together

. She also has asthma, so indoors would be better for her (although that point won't make a difference at Wimbledon).
Her hitting is even more fierce indoors so as long as she controls the points and doesn't let Bouchard she could roll easily. Bouchard also hits hard, fast, and flat so she should benefit too but she has played many less indoor matches (not sure if she played any so far).