We are Immigrants couple in TX. Indian origin. We both are in early 40s. Last year while my son attending his soccer training he got a local friend in his age. Because of this her mother started conversations with us. She is 2 years elder to me.They are white. Later we moved to a different club for his training and we didn't contracted them. A couple of months ago we accidentally met them in a game. She came to us and we had a good talk. We (myself and wife) exchanged our numbers with her. She regularly texted us and we occasionally reply. Everything casual talks only. Then only we came to know that she is a single mother. Divorced and her elder kids with ex . Now a days she is inviting and suggesting the boys should go sports together. Yesterday she invited us for Valentines day dinner at her place. She told her friends also would be there. But when we went we were only there. We had a good dinner. But we feeling something wrong. The boys are in good friendship. We don't want to hurt anyone but don't know how to understand her real intentions. She is calling my wife daily now a days. She never expressed anything wrong but even suggesting summer trip together.

Our cultural differences might be the reason we feel like this.
Any advice.