The international pop sensation had earlier defied the call of Saudi Arabia based women rights activists to boycott the concert and called her performance as a step towards promoting gender equality.
The Caixin/Markit services purchasing managers' index (PMI) fell slightly to 53.6 in January from 53.9 in December, but well above the 50.0 mark separating growth from contraction.
Business groups have warned of widespread disruption if there are lengthy delays to EU imports due to new customs checks, and even possible shortages of food and medicine.